Gold has more of a buttery yellow tone while warm golds are much richer. A lot of my clients want to go super light for the summer, so we go a little richer and a little darker and allow those highlights to hybernate during the winter. Your colorist can get you there with a gloss.
Phospholipids are the main constituents of cell membranes. They resemble the triglycerides in being ester or amide derivatives of glycerol or sphingosine with fatty acids and phosphoric acid.
1. Fatty Acids. The common feature of these lipids is that they are all esters of moderate to long chain fatty acids. Acid or base-catalyzed hydrolysis yields the component fatty acid, some examples of which are given in the following table, together with the alcohol component of the lipid.