How Much Developer to Add to Hair Dye: Safe Ratios
The usual amount of developer to add to permanent hair dye is a 1:1 ratio, meaning equal parts color and developer. High-lift blonde formulas often require 1 part color to 2 parts developer, while demi-permanent products may use 1:1.5 or another brand-specific ratio. Always follow the instructions for the exact color line before mixing. Key […]