Glossary Terms beginning with H

H

Hair Colorant

Ingredients that impart color to hair. Hair coloring preparations may be temporary, semi-permanent, permanent, or progressive, depending on the length of time the colorant affects the hair.

Hair Conditioning Agent

Ingredients that enhance the appearance and feel of hair, by increasing hair body, suppleness, or sheen, or by improving the texture of hair that has been damaged physically or by chemical treatment.

Hair Fixative

Ingredients that help hair hold its style by inhibiting the hair?s ability to absorb moisture.

Hair-Waving and Straightening Agent

Substances that modify hair fibers to facilitate changes to the structure of the fibers, such as with permanent waves or with hair straightening.

Heavy Metal

Heavy metals are higher atomic weight elements that have properties of a metallic substance at room temperature. Some heavy metals, such as iron, cobalt, copper, manganese, and zinc are required in small amounts by living organisms. Other heavy metals, such as mercury, lead and cadmium have no known beneficial effects.

Hull

The dry outer covering of a fruit, nut, or seed.

Humectant

Ingredients that slow the loss of moisture from a product during use.

Husk

The outer covering of various seeds or fruits.

Hydrocarbon

Organic compounds consisting entirely of hydrogen and carbon.

Hydrolysate

The product of hydrolysis.

Hydrolysis

Decomposition of a chemical compound into smaller constituents by reaction with water.