Black Oxygen for hair 20vol/6% - 1000ML

The product you mentioned is Black Oxygen for hair 20 volume / 6% – 1000 ml, and it is usually used as a hair color developer when dyeing hair. Here are the important details about it: Concentration: 20 volume / 6%, suitable for lightening hair by one level or for fixing the natural hair color when dyeing. Usage: Mixed with hair dyes or coloring powders to activate the color. Quantity: 1000 ml, a large size suitable for intensive home use or beauty salons. Result: Helps penetrate the color inside the hair better and ensures color stability. Important note: Not used alone, always mix it with the designated dye. Perform a sensitivity test before use on the skin to avoid any allergic reaction. Not used on damaged or injured scalp.