I used her 1:1 ratio and added a little twist. I've been using this homemade BB cream for a week with no unpleasant surprises. Awesome!
Here's the 411:
Making homemade BB cream. In a clean, new, .02 ounce makeup container (lip gloss size), add 4-5 drops of tea tree oil, to equal parts ColorStay whipped makeup and Derma-e Tea Tree and E Antiseptic Creme. Stir with a new wooden stir stick until the mixture is uniformly blended. That's it.
I suggest making the creme is small batches. This minimizes the potential for the blend growing old in the bottom of makeup bag.
Approximate Costs:
Makeup - $11-15
Moisturizer - $5-8
Tea tree oil (1 oz bottle) - $8-12