Highlighter dust usually comes in gold and silver colors and gives a high-sheen, metallic finish. Most highlighter dust is not edible and is for decorative purposes only. Provides a more metallic shiny finish than luster dust.
Brush on fondant and gumpaste. Mix with clear alcohol to airbrush. Or if you want an evener application or intense color, mix the luster dust with oil, alcohol (vodka is recommended), or an alcohol-based extract like lemon extract. It only takes a small amount of liquid, so start with a few drops and mix until you get a consistency you like. Do not mix the luster dust with water, as the majority are not water-soluble and will result in a sticky mess.