{"id":10331,"date":"2026-06-28T00:00:39","date_gmt":"2026-06-28T00:00:39","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10331"},"modified":"2026-06-28T21:10:03","modified_gmt":"2026-06-28T21:10:03","slug":"security-ink-photoinitiator","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/ko\/security-ink-photoinitiator\/","title":{"rendered":"Photoinitiator for UV Security Inks: How to Choose for Covert Marks, Pigment Burden, and Press Route"},"content":{"rendered":"<p><strong>\ube60\ub978 \ub2f5\ubcc0:<\/strong> buyers choosing a <strong>photoinitiator for UV security inks<\/strong> usually get a better first sample plan when they separate three different problems early: a <strong>clean conventional benchmark for lighter or lower-build security prints<\/strong>, a <strong>balanced route for colored systems and wider press flexibility<\/strong>, and a <strong>harder-cure route for more pigment-shielded or thicker security ink packages<\/strong>. In Longchang&#8217;s current product set, <a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-184-cas-947-19-3\/\">\uad11\uac1c\uc2dc\uc81c 184<\/a> is the practical first benchmark when the job is built around routine offset, screen, flexo, or inkjet security printing with a familiar around-365-nm cure window. <a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-bms\/\">\uad11\uac1c\uc2dc\uc81c BMS<\/a> moves up when the buyer needs a more balanced route across <strong>surface cure, depth cure, colored systems, low odor, minimal yellowing, and mercury-lamp plus UV-LED relevance<\/strong>. <a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-itx-cas-5495-84-1\/\">\uad11\uac1c\uc2dc\uc81c ITX<\/a> becomes the stronger problem-solving route when the security ink behaves like a <strong>thicker, darker, or more difficult pigmented system<\/strong> instead of an easy benchmark job.<\/p>\n<p>This page is intentionally narrower than a broad packaging-ink or label-ink article. The buyer question here is different: <strong>which photoinitiator route should be screened first when the printed layer must cure cleanly while still carrying overt or covert security information on labels, packaging, documents, or related authentication work?<\/strong><\/p>\n<h2>Why UV security inks need a dedicated shortlist<\/h2>\n<p>Conservative industry guidance around security inks treats them as more than ordinary decorative printing. Security-print programs often combine <strong>verification function<\/strong> with real production constraints such as offset, flexo, screen, lithographic, or inkjet printing. Buyers also tend to care about several things at once: print clarity, low set-off, consistent cure, colored or special-pigment behavior, and whether the mark is meant to stay visible, become visible only under verification, or act as a secondary authentication layer.<\/p>\n<p>That is why the first screening questions are usually:<\/p>\n<ul>\n<li>Is the security layer mainly <strong>light-colored and straightforward<\/strong>, or is it more <strong>pigmented, darker, or technically difficult<\/strong>?<\/li>\n<li>Is the print route closer to <strong>offset, screen, flexo, or mixed security-print production<\/strong>?<\/li>\n<li>Is the main commercial risk <strong>yellowing, incomplete cure, poor consistency, or difficulty in colored systems<\/strong>?<\/li>\n<li>Is the curing window mainly <strong>conventional mercury UV<\/strong>, or does the buyer also need <strong>UV-LED compatibility<\/strong>?<\/li>\n<li>Is the security mark a simple secondary print feature, or part of a more demanding label, document, or packaging-authentication package?<\/li>\n<\/ul>\n<p>When those questions are ignored, teams often test too many overlapping photoinitiators without learning which route actually fits the security-print problem.<\/p>\n<h2>Shortlist table: when 184, BMS, or ITX usually makes sense<\/h2>\n<table>\n<thead>\n<tr>\n<th>\ud3ec\ud1a0 \uc774\ub2c8\uc2dc\uc5d0\uc774\ud130<\/th>\n<th>Best fit in UV security inks<\/th>\n<th>\uad6c\ub9e4\uc790\ub4e4\uc774 \uc65c \uadf8\uac83\uc744 \ud6c4\ubcf4\uc5d0 \uc62c\ub9ac\ub294\uac00<\/th>\n<th>Main caution<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>184<\/td>\n<td>Lighter-color or lower-build security inks, routine conventional UV screening, straightforward offset or screen benchmarking<\/td>\n<td>Longchang positions 184 for offset, screen, flexographic, and inkjet printing inks, with high absorption efficiency around 365 nm, rapid curing, and low-yellowing value in lighter systems.<\/td>\n<td>It is not the strongest first answer when the security layer becomes more pigmented, harder to cure through, or more dependent on LED-ready flexibility.<\/td>\n<\/tr>\n<tr>\n<td>BMS<\/td>\n<td>Balanced security-print routes needing stronger surface and depth cure, colored-system support, and mercury-lamp plus UV-LED flexibility<\/td>\n<td>Longchang positions BMS for flexographic, screen, offset, and inkjet inks, low odor, minimal yellowing, colored and white-system relevance, and combined surface plus deep cure with an amine synergist.<\/td>\n<td>The route should be evaluated as a formulation package because the cure balance depends on an amine synergist.<\/td>\n<\/tr>\n<tr>\n<td>ITX<\/td>\n<td>More difficult security inks with thicker films, darker shades, or stronger pigment-shielding pressure<\/td>\n<td>Longchang positions ITX for thick films, pigmented systems, screen printing inks, packaging printing inks, and electronics-related precision printing work.<\/td>\n<td>It is usually the better problem-solving route rather than the default answer for every clean or lightly colored security-print job.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When 184 is the better fit<\/h2>\n<p><a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-184-cas-947-19-3\/\">\uad11\uac1c\uc2dc\uc81c 184<\/a> deserves the first look when the buyer wants a <strong>clean conventional benchmark<\/strong> before moving to more specialized security-ink routes. Longchang directly positions 184 for <strong>offset printing inks, screen printing inks, flexographic printing inks, and inkjet printing inks<\/strong>. The current product page also emphasizes <strong>high absorption efficiency around 365 nm<\/strong>, rapid curing, and practical fit for <strong>low to medium-thickness coatings, inks, and glues<\/strong>.<\/p>\n<p>That keeps 184 highly useful when:<\/p>\n<ul>\n<li>the security mark is relatively <strong>light-colored, transparent, or lower-build<\/strong><\/li>\n<li>the line is centered on a familiar <strong>around-365-nm conventional UV window<\/strong><\/li>\n<li>the team wants a fast baseline comparison before moving to more specialized routes<\/li>\n<li>the buyer still cares about <strong>\ub0ae\uc740 \ud669\ubcc0<\/strong> in cleaner or appearance-sensitive printed areas<\/li>\n<li>the production problem is still a routine print benchmark rather than a difficult pigmented cure-through problem<\/li>\n<\/ul>\n<p>If the security-print job is straightforward and the team needs a credible first reference point, 184 is usually the right place to start.<\/p>\n<h2>When BMS is the better fit<\/h2>\n<p><a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-bms\/\">\uad11\uac1c\uc2dc\uc81c BMS<\/a> becomes more attractive when the buyer is not only asking for cure speed, but for a more balanced security-print route across <strong>colored systems, print consistency, and broader process flexibility<\/strong>. Longchang describes BMS as a <strong>Norrish type II photoinitiator<\/strong> that provides <strong>high reactivity, surface cure, and depth cure<\/strong> with an amine synergist in UV and LED-curable formulations.<\/p>\n<p>That is commercially useful in security printing because authentication layers often need more than a fast surface set. They may also need repeatable cure across real press conditions and colored formulations. BMS deserves earlier screening when:<\/p>\n<ul>\n<li>the security ink includes <strong>colored or white systems<\/strong> instead of only easy transparent layers<\/li>\n<li>the line needs a stronger balance of <strong>surface dry and through-cure<\/strong><\/li>\n<li>the buyer wants one route already positioned for <strong>traditional mercury lamps and UV-LED light sources<\/strong><\/li>\n<li>low odor and minimal yellowing still matter in the final printed package<\/li>\n<li>the team wants a security-print route that already sits across <strong>flexographic, screen, offset, and inkjet<\/strong> wording on the company page<\/li>\n<\/ul>\n<p>For harder colored security-print jobs, BMS is often the better commercial answer than stretching a simple benchmark route too far.<\/p>\n<h2>When ITX is the better fit<\/h2>\n<p><a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-itx-cas-5495-84-1\/\">\uad11\uac1c\uc2dc\uc81c ITX<\/a> should move forward earlier when the security-ink project behaves like a <strong>difficult pigmented-system or thicker-film job<\/strong> instead of a routine benchmark. Longchang directly supports ITX for <strong>thick films, pigmented systems, screen printing inks, and packaging printing inks<\/strong>. The current company wording also extends into <strong>PCB photoresists and solder mask inks<\/strong>, which reinforces ITX as a more precision-oriented and problem-solving route when the printed layer becomes harder to cure through.<\/p>\n<p>That matters in security-print work because some authentication layers are not simple light transparent graphics. Dense decorative shades, more shielding pigment packages, or higher-build printed features can quickly expose a weak first shortlist. In those cases, ITX is commercially useful because its current public positioning is already closer to difficult cure-through conditions than a basic benchmark route.<\/p>\n<p>Used that way, ITX is not the universal default. It is the route buyers should review when the real security-ink package is tougher than the cleaner benchmark suggests.<\/p>\n<h2>\uad6c\ub9e4\uc790\ub294 \uc0d8\ud50c\uc744 \uc694\uccad\ud558\uae30 \uc804\uc5d0 \uc5b4\ub5bb\uac8c \ud6c4\ubcf4\ub97c \uc555\ucd95\ud574\uc57c \ud560\uae4c\uc694<\/h2>\n<ol>\n<li><strong>Start with the printed layer itself.<\/strong> A lightly colored secondary security overprint should not use exactly the same first shortlist as a denser pigmented authentication layer.<\/li>\n<li><strong>Check the real press route.<\/strong> Offset, screen, flexo, and mixed security-print workflows can reward different starting assumptions.<\/li>\n<li><strong>Separate surface cure from deeper cure.<\/strong> A mark can look acceptable on the surface and still leave hidden weakness in a more difficult printed layer.<\/li>\n<li><strong>Keep verification cleanliness in scope.<\/strong> If the security layer depends on stable visual response, excessive yellowing or inconsistent cure becomes a real commercial problem.<\/li>\n<li><strong>Keep the first sample round tight.<\/strong> Two or three clearly differentiated routes usually produce a faster answer than testing a long mixed list.<\/li>\n<\/ol>\n<h2>Recommended Longchang product and article paths<\/h2>\n<ul>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-184-cas-947-19-3\/\">\uad11\uac1c\uc2dc\uc81c 184<\/a> for routine conventional UV security-ink benchmarking<\/li>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-bms\/\">\uad11\uac1c\uc2dc\uc81c BMS<\/a> for balanced colored-system and LED-ready security-print routes<\/li>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-itx-cas-5495-84-1\/\">\uad11\uac1c\uc2dc\uc81c ITX<\/a> for thicker or more pigment-shielded security-ink packages<\/li>\n<\/ul>\n<p>Related reading for adjacent decisions:<\/p>\n<ul>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/tamper-evident-label-photoinitiator\/\">Photoinitiator for Tamper-Evident Label Inks<\/a><\/li>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/label-ink-photoinitiator\/\">Photoinitiator for Label Inks<\/a><\/li>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/packaging-ink-photoinitiator\/\">Photoinitiator for Packaging Inks<\/a><\/li>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/uv-offset-ink-photoinitiator\/\">Photoinitiator for UV Offset Ink<\/a><\/li>\n<li><a href=\"https:\/\/longchangchemical.com\/ko\/uv-screen-ink-photoinitiator\/\">Photoinitiator for UV Screen Ink<\/a><\/li>\n<\/ul>\n<h2>\uc790\uc8fc \ubb3b\ub294 \uc9c8\ubb38<\/h2>\n<h3>Which photoinitiator is the best starting point for UV security inks?<\/h3>\n<p>There is no single universal answer. In Longchang&#8217;s current public product set, 184 is often the best first benchmark for lighter and more routine conventional UV security-print work, BMS is the more balanced route for colored systems and wider process flexibility, and ITX moves up when the ink package is harder to cure through.<\/p>\n<h3>Why is security ink selection different from a general packaging-ink decision?<\/h3>\n<p>Because security-print work often combines authentication function with strict print consistency, colored or special-pigment behavior, and tighter process control. That makes cure reliability and shortlist discipline more important than in a generic decorative-ink discussion.<\/p>\n<h3>When should BMS outrank 184?<\/h3>\n<p>BMS should move ahead when the buyer wants a more balanced surface-plus-depth cure route, direct support for colored and white systems, and a path already positioned for both mercury-lamp and UV-LED formulations.<\/p>\n<h3>When should ITX enter the first sample round?<\/h3>\n<p>ITX should enter earlier when the security ink behaves like a thicker, darker, or more pigment-shielded system rather than a straightforward lighter-color benchmark.<\/p>\n<h2>Next step<\/h2>\n<p>If your UV security-ink project is being slowed by colored-system cure balance, pigment shielding, or inconsistent performance across offset or screen production, first decide whether the bottleneck is <strong>a clean conventional benchmark<\/strong>, <strong>a balanced colored-system route<\/strong>, or <strong>a genuinely difficult pigmented-system problem<\/strong>. Then compare <a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-184-cas-947-19-3\/\">184<\/a>, <a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-bms\/\">BMS<\/a>, \uadf8\ub9ac\uace0 <a href=\"https:\/\/longchangchemical.com\/ko\/product\/photoinitiator-itx-cas-5495-84-1\/\">ITX<\/a> against the real printed security layer instead of choosing only from generic UV-ink wording.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical B2B guide to choosing a photoinitiator for UV security inks by comparing 184, BMS, and ITX for covert or overt marks, offset and screen routes, pigmented systems, and cure reliability.<\/p>","protected":false},"author":6,"featured_media":10332,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10331","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Photoinitiator for UV Security Inks: 184 vs BMS vs ITX<\/title>\n<meta name=\"description\" content=\"Learn how to choose a photoinitiator for UV security inks by comparing 184, BMS, and ITX for covert marks, offset or screen printing, pigmented systems, low yellowing, and cure reliability.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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