Coloring product, in particular for dyeing or refreshing dyes in textile materials with indigo dyes

A method for dyeing of or refreshing of dyeing in textile materials, the method comprising:

• adding a dye-releasing product into a washing machine with textile materials, the dye-releasing product comprising:
• a flat, cloth-like carrier material,
• at least one coating applied onto the carrier material and at least one indigoid dye in its oxidized form encompassed by the coating, wherein the coating additionally comprises at least one binding agent for the at least one dye such that the at least one dye is released, beginning at a temperature of about 20° C. in an aqueous solution, wherein the coating is soluble, at least in part from the flat carrier material, which is added to the textile material to be dyed or whose dyeing is to be refreshed in a washing process;
• and
• adding an aqueous solution into the washing machine, wherein the dye-releasing product dyes or refreshes dye in the textile materials when the aqueous solution is at a temperature of at least 20° C. and the dye-releasing product is in the aqueous solution for a time period of at least 10 minutes.