its usually equal parts, unless you're using a highlift color, or fashion shade. you should've found this out when you bought the product. guessing will likely result in undesired results.
also, different brands will have different formulations.
again, you should've gotten this info at the store...hence the reason its not a good idea to use cosmetology chemicals if you aren't educated in that field.
at 8:48 PM on Jan. 7, 2011