MissC88 advised: "to dissolve the powder, but it in the cream or lotion that you want to mix it with, if the cream/lotion isn't already in a plastic or glass container/jar, put it in one, then boil some water and hold the container/jar in the boiling water. the hydroquinone will dissolve in minutes. So, how do I kno this? I also have the powder and thats how I always dissolve it. My mother, who's a pharmacist, told me this method" - What I would like to know is, does it matter what type of container you put your cream/lotion in - does the container have to be glass or plastic, clear or dark?