opacifiern.
/əʊˈpasᵻfʌɪə/, U.S. /oʊˈpæsəˌfaɪər/ A substance added to make something opaque.
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the world > matter > light > transparency or translucence > opacity > [noun] > making or becoming opaque > that which
opacifier1911
1911 Chem. Abstr. 5 168 Cast Iron Enamels... SnO2 and cryolite are the best opacifiers.
1940 G. H. J. Adlam & L. S. Price Higher School Certificate Inorg. Chem. (ed. 2) xlii. 416 Arsenious oxide is used in the glass industry as an opacifier.
1959 Which? Nov. 152/1 Opacifiers (which make it look opaque and creamy) make the shampoos look more attractive.
2000 Ceramic Rev. Jan. 42/2 I then began by testing every flux and opacifier on my shelves, barium carbonate, bone ash, calcium borate frit, [etc.].
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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n.1911