IPA: /ˈlɪθəˌpoʊn/
KK: /ˈlɪθəˌpoʊn/
A white substance used as a pigment, made from a combination of certain chemicals including zinc sulfide and barium sulfate.
The artist chose lithopone for its bright white color in the painting.
Lithopone is formed from "lithos" (from Greek, meaning stone) and "pone" (from Greek "ponein", meaning to place). The word refers to a compound that is essentially a 'stone' pigment placed in various applications, particularly in paints.
Think of 'stone' ('lithos') being 'placed' ('pone') in products like paint — that's how lithopone serves as a pigment.
No commonly confused words.