Try rinsing the foils of the fasion colors as you pull them, using cool water, and then using a clear demi color seal over the fasion color. It not only helps to prevent bleeding, it also makes the fasion color "pop" by giving it a high gloss shine in contrast.

You always run the chance of bleeding onto the lighter color. What I found that will work it to add the cool color like pink, red, purple, using So. Cap. Hair Extensions. Just on the top on the head. They also will not fade and can be re-use. It fast and cost less, with any damage.

I like what she said but to add to that if you are doing foils scrunch the foils and then use COLD water, because that will close down the cuticle of the hair shaft. if the 10-11 hair is really porus try keritin mist by CHI it has a Ph of 3.5 and it is made to equal out the porosity levels of the hair first it is an awesome product!good luck I love your hair