How long do you have to be in the sun for Sun In to work?

SunIn is a spray-on hair lightener. It works on blond to medium brown hair. The directions state that after you apply, it is heat activated, so you either go out into the sun, or use the blow dryer to bring out the highlights.

Does it work? Yes, to a point. The sun lightens the hair anyway. You have to have lighter hair to begin with or SunIn will not show results. In the old days (1940-60s), we used lemon juice for light hair and vinegar for darker hair and accomplished the same thing. Actually the lemon/vinegar was used to cut the soap of the shampoos used back then, but we all thought that it highlighted our hair.