How does hydrogen peroxide cream and lightening powder work?

Is it mostly the hydrogen peroxide cream doing the lightening? Or mostly the lightening powder? Or both at once? What would either do by itself? Just curious. Thanks if anyone knows.How does hydrogen peroxide cream and lightening powder work?
they work together. The powder would do nothing by itself, except maybe make you itch. The peroxide would slowly lighten your hair over time if you put it in over time, but it's not balanced for a stop process like this and causes soooooooo much damage and often a chemical cut because without the ingredients in the powder for it to grab on to it never fully gets washed out of your hair.