questions about article by William

I found an article containing a basic mathmatic formula, to use when lifting, written by William. It was dated 12-00 and last revised 04-06. I have a couple questions and the article directs people to the hair talk forums. I am hoping someone knows how to contact William or knows the article and might be able to answer for him.thanks 

Yes,that's it and thank you for writing. The formula:target level (8) x 2= 16 ,answer - natural level (6) =10. He said that this gave you number of levels of lift (2) and this is my question; 10 is 4 levels from the natural level. I can understand how this could give me an 8 result but I am not sure what developer he means for you to use.

Thank you Karen. I'm sorry that My question was confusing.I meant what developer did william mean to be used with that formula example that he put in his article.

twilife wrote: Yes,that's it and thank you for writing. The formula:target level (8) x 2= 16 ,answer - natural level (6) =10. He said that this gave you number of levels of lift (2) and this is my question; 10 is 4 levels from the natural level. I can understand how this could give me an 8 result but I am not sure what developer he means for you to use. I am excited to find a base formula to go from I just don't understand it all yet.

Math is not really my forte', but the way I understand it, he doesn't really tell you what developer to use, but what level of color.  So you are saying you are a 6 and you want to go to 10? It is not clear to me what the 2 represents in this formula and if it is always supposed to be 2, or if it represents the number of levels difference between the 6 and the 8 in his example.  The way I understand it,  the 2 is not the number of levels different, and it is always supposed to be 2.  So that would be the target level 10 x 2 =20, minus the 6 you are = 14.  All he really says about the number you get is that if its over 13, you will need to prelighten, and it will take more than one process to get where you want.

I don't know for sure about the math, but sure enough, if you are a level 6, I know from experience that you will indeed need to prelighten with bleach before you can get to a 10, (meaning it will be more than one dye job to get you to a 10).  This was, I believe, the purpose of the article.  Not so much to tell you exactly what you need to do, but to tell you what can and can't be done in one job and to suggest that you should see a pro if more than one job is required.

So to answer your question, you will have to bleach first, then what developer you use, (or what you need to do at all) will be based on how light you are after the bleaching.

susan: u got it wrong. In that article , what he meant was ,if u are a natural LVL 6 n u wish to Lift to a LVL 8, u would need to use a lvl 10 color ..got it