filter4dフェノールレッド liquid, 0.5%, sterile-filtered, BioReagent, suitable for cell culture; CAS Number: 143-74-8; Synonyms: Phenolsulfonphthalein solution at Sma-AldrichFILTER THROUGH SOMETHING definition: 1. to appear or happen gradually or to a limited degree through something: 2. to appear or happen…. Learn more.