Chemistry & ProductsQuestion 316 of 484
Oxidative (permanent) hair color and developer that have already been mixed should be:
a.Used immediately and any leftover discarded; never stored for later use
b.Capped and refrigerated for up to 30 days
c.Stored in an open bowl on the counter until the next client
d.Diluted with water and saved for the next root touch-up
Explanation
Once color and peroxide are combined, the oxidation reaction begins. The mixture loses strength, can build dangerous pressure if sealed in a bottle, and is unsafe to apply later. Mix only what you need and discard leftover per the SDS.
Practice all 484 questions free — no signup required.
Related questions on this topic
- A new cosmetologist wants to know the product name, manufacturer, and emergency contact for a chemical in the dispensary. Which section of the GHS Safety Data Sheet contains that information?
- Which SDS section lists the recommended ventilation, gloves, and eye protection required when working with a chemical?
- Most lotions, conditioners, and creamy hair colors are oil-in-water (O/W) emulsions, meaning:
- From a molecular standpoint, why does methyl methacrylate (MMA) carry a much higher allergy and damage risk than ethyl methacrylate (EMA) on natural nails?
- A client wants a serum to help refill water loss in dehydrated skin without leaving a greasy film. Which ingredient is BEST known for binding many times its own weight in water within the upper skin layers?
- Ceramides are added to moisturizers primarily because they:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California Board of Barbering & Cosmetology Exam · How we review