Why do I need a pre-punched processing bag when using Color Express additives?
A pre-punched processing bag allows ammonia and body heat to escape during the processing time. Ammonia is a strong and potentially damaging chemical for the hair. Body heat can interact with the ammonia in the color mixture and cause shades to come up lighter and with a translucent effect. ***If you only have a regular processing bag, fold it over 4 times and hit it 6 times with a rat-tail comb; you’ll have 24 holes.
