Question for professional hairdressers or people who are knowledgeable about hair products and dye?

I have had my hair dyed blond and highlighted at times the past five years. i want to put a SEMI permanent brown in to see what its like with brown hair for awhile. i would love to have it brown for a month or two. semi permanent says, 6-12 WASHES on the carton, however i am aware the bc ive dyed it blond it will be more porous and probably darker than the color on the box. someone told me there is a product you can buy that youapply to your hair before putting the semi brown color in, and it is supposed to ';close'; the pores of your hair temporarily so that the dye will go on as if your hair wasnt bleached-and actually wash out after a short period of time. is this true? if so, what is this product called? if this isnt true, any suggestions?


( i do not wnat to pay for this done profesionally so please do not suggest go to your hair stylist. ) I appreciate your response. Question for professional hairdressers or people who are knowledgeable about hair products and dye?
They are talking about a filler. A filler basically ';fills in'; whats missing from bleached hair to allow the new color molecules to ';stick'; to the hair. You cannot just color your hair with a dark semi-permanent and expect it to return to your blonde after a few washes. Semi-permanent color can act like a permanent color on bleached hair. A filler is used to achieve optimum results so the color does not fade as bad.





If you really want to just see what it would like I suggest a rinse, such as Roux Fanciful rinses. Even with these you may have a tough time getting your blonde back but your chances are much better.Question for professional hairdressers or people who are knowledgeable about hair products and dye?
Okay, here goes. At least go to a hair colorist for a consultation. A colorist is a hairstylist who has spent time in extra study just on the chemical reactions of color on hair. A good one will ask what products you have used previously on your hair (you will need to bring a list of the products you and your stylist have used including brands and numbers or names of color, bleach, shampoos, conditioners, etc.) and whether or not you are on any medications, etc. Listen to what they have to say VERY carefully. You really are better off letting a pro do this for a lot of reasons, but with a consultation you can at least get a better idea as to which product you are talking about and if it will even work for you.