Hair Lessons

"Base" and "No Base" Formula - Hair Relaxer (Hair Chemical Guide)

Entirely distinct from the chemical concept of base as a wider definition for "alkaline", lye relaxers may be labelled as "base" or "no base". In this instance, the "base" refers to a preliminary coating of petroleum jelly onto the scalp to protect it from being irritated or burned by the lye cream.

 "No base" creams have a lower concentration of lye and may be applied directly to the hair roots without requiring the protective "base" layer, although these weaker products may still irritate the skin of some people who must therefore coat their scalps beforehand anyway.