I'm highlighting my own hair, pulled through cap. I have lost the instruction on mixing. I have the prism lites blue and 20 volume crème. What would the mixing equal. 2 scoops of lites to 2oz of volume 20. I think this is what I used . My hair is dark but has been highlighted professional and I'm trying to mostly do the dark roots.

What is the formula for mixing prismlites blue with 20 volume creame

What are you asking? How to highlight just your roots?

How do I find the material saftery data sheet (msds) for salon care prism lites blue?

To find the MSDS, you are going to have to contact Sally's Corp. office personally. I tried everywhere. Sally's doesn't have the MSDS in stores because they do not use the product in the store, so no need for it there. :)