Part of an Easter egg kit NYT crossword clue

An Easter egg kit typically includes various items used to decorate eggs, with one essential component being the coloring agent. This substance is used to change the eggs’ appearance by staining them with different hues.

The answer is **”DYE.”** Dye is a soluble substance used for coloring materials, and in the context of Easter, it’s employed to give eggs vibrant and festive colors. This makes it a fundamental part of any Easter egg decorating kit.