{"id":9271,"date":"2026-05-08T11:08:34","date_gmt":"2026-05-08T03:08:34","guid":{"rendered":"https:\/\/www.zleygroup.com\/?p=9271"},"modified":"2026-09-22T16:55:54","modified_gmt":"2026-09-22T08:55:54","slug":"illuminante-%c2%b7-antinfiammatorio-%c2%b7-correzione-delle-imperfezioni-un-agente-illuminante-di-nuova-generazione-per-la-pelle-sensibile","status":"publish","type":"post","link":"https:\/\/www.zleygroup.com\/it\/brightening-%c2%b7-anti-inflammatory-%c2%b7-spot-correction-a-next-generation-brightening-agent-for-sensitive-skin\/","title":{"rendered":"ZLEY\u00ae BRC-WS: 4-Butylresorcinol Blend and Formulation Guide"},"content":{"rendered":"
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ZLEY\u00ae BRC-WS: A 4-Butylresorcinol Blend for Brightening Formulas<\/h2>
\"ZLEY
<\/figcaption><\/figure>

ZLEY\u00ae BRC-WS is a formulated ingredient blend containing 4-Butylresorcinol (CAS 18979-61-8)<\/strong>. Check identity against the current ZLEY\u00ae BRC-WS technical data sheet<\/a> e PubChem<\/a>.<\/p>

What is in the blend?<\/h3>

The published ZLEY\u00ae technical sheet lists water, propanediol, hydroxypropyl cyclodextrin, 4-Butylresorcinol and sodium bisulfite. It specifies 12.5% \u00b1 1.0% 4-Butylresorcinol<\/strong> in the supplied blend. This is a different material from neat 4-Butylresorcinol powder: a percentage of BRC-WS added to a formula is not the same percentage of the active molecule.<\/p>
Buyer check<\/th>Perch\u00e9 \u00e8 importante<\/th><\/tr>
Active content<\/td>Calculate the active contribution from the actual batch assay.<\/td><\/tr>
Carrier composition<\/td>Check compatibility with the complete formula and its labeling requirements.<\/td><\/tr>
Appearance and pH<\/td>Compare the delivered batch with the current COA and TDS.<\/td><\/tr>
Finished-product stability<\/td>Test color, clarity, packaging and performance under relevant storage conditions.<\/td><\/tr><\/tbody><\/table>

Use level is not a universal safety limit<\/h3>

The published TDS suggests a 1\u20136% addition level for the blend<\/strong>. It is a supplier formulation suggestion, not a universal regulatory maximum or a guarantee of finished-product safety. The older table of product-type \u201cmaximum safe concentrations\u201d lacked a verifiable source and has been removed. Choose a level through market-specific regulatory review, exposure assessment and testing of the finished formula.<\/p>

The supplier safety data sheet<\/a> flags irritation hazards when handling the concentrated raw material. This does not establish the safety or irritation profile of every diluted finished product; both raw-material handling and finished-product use need their own assessment. Likewise, claims of improved penetration, sustained release or superior clinical performance need evidence specific to the grade and finished formula.<\/p>

Compare grades and request documents<\/h3>

See the ZLEY\u00ae BRC-WS product page<\/a> for the marketed blend. If you are comparing it with the neat powder, read our 4-Butylresorcinol formulation guide<\/a> and request current TDS, SDS and batch COA for both grades. Send your format and target market to services@zleygroup.com<\/a> so the discussion starts with the relevant specifications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

ZLEY\u00ae BRC-WS contains 4-Butylresorcinol (CAS 18979-61-8). Compare its TDS, active content and formulation checks with the neat powder grade.<\/p>","protected":false},"author":1,"featured_media":8617,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[69],"tags":[],"class_list":["post-9271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-active-ingredients"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/posts\/9271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/comments?post=9271"}],"version-history":[{"count":0,"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/posts\/9271\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/media\/8617"}],"wp:attachment":[{"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/media?parent=9271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/categories?post=9271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zleygroup.com\/it\/wp-json\/wp\/v2\/tags?post=9271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}