Although writers are fond of comparing the size of various objects to the pinhead, it is a very inexact quantity. Measurements of heads of pins (not including pins whose heads are glass or plastic beads) in a fabric shop shows that some are as small as 1 millimeter in diameter and others as large as 1.9 millimeters.
In Indian cooking, the amount that can be held on a pinhead is used as a unit of measure for very powerful ingredients, such as camphor.
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Last revised: 8 May 2000.