Pravana ChromaSilk Creme Hair Color. The low-ammonia formula employs a proprietary blend of human hair keratin amino acids and pure silk protein to provide protection, added strength and unparalleled shine. Hydrolyzed silk amino acids, because of their small molecular weight and affinity to adhere to the hair fiber, act as "carrying agents" to help drive color deep in to the hair fiber, providing unmatched color vibrancy and durability. Chromasilk's low-ammonia formula allow users to mix the color with Pravana's exclusive Zero Lift Creme Developer to create a semi-permanent, no-lift hair color from any of the ChromaSilk Permanent Creme hair colors. Low-Ammonia Formula.