Sparks – Hidracolor 40 Vol. Creme Peroxide Developer 4.56oz #SP-04873 Sparks Creme Developer is formulated specifically for use with the Sparks Powder Lightener. The gentle formula quickly lightens while maintaining the hair integrity.Stabilized formulaUse in place of clear 20 volume developerProvides extra lightening action in one stepIngredients: Water, hydrogen peroxide, cetearyl alcohol, isopropyl myristate, sodium laureth sulfate, ceteareth–25, tetrasodium EDTA, etidronic acid.