Gamblin elaborates a bit on this color elsewhere. They describe zinc as having the “weakest tinting strength and incredible transparency. It can be used successfully as a white in glazes and scumbles where the glaze needs to modify light or atmosphere without “whiting out” what is below. Think of depicting the mist where the ocean meets the land, the transparency of a woman’s veil, or the flare of light coming off glass. Zinc White makes this easy to depict where titanium based whites makes this exceedingly difficult.

A note of advice concerning Zinc White: unless you are painting on a panel, Zinc White should not be used as the primary white in an oil painting. Zinc creates a brittle paint film which can cause cracking on stretched fabric supports…“ - Gamblin Oils. For a Gamblin take on zinc, check out https://gamblincolors.com/zincoxideinartistoilcolors/. More information about Gamblin’s white colors can be found at: https://gamblincolors.com/getting-the-white-right-by-robert-gamblin/