When I combine Retinol 50C (which is retinol and Polysorbate 20 and some BHA and BHT) with Vitamin K, my product turns red in color. I am using high levels of each ingredient. I decided to perform a test by adding each ingredient together and sure enough it forms a red color instantly. To eliminate any issue with ethoxylates, I tested Vitamin K with Polysorbate 20 and no color problem. Can anyone tell me what is happening? When I do test the two ingredients together, the red color is formed but no precipitation forms at least not at room temperature after a week. Any insight into this reaction would be helpful.