lead oxide

[ led ]

Phonetic (Standard)IPA

noun

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It is composed of flint, siliceous sand, a little potash or soda, and about two-fifth parts of lead oxide.

Lead oxide is desirable up to about .5 equivalent and it is an advantage to use feldspar so that K2O may be introduced.

The color is yellowish and the lead oxide is apt to destroy the hue of any colors which are used with it.

When present in sufficient quantity the five last-named give enamel-white beads; lead oxide in excess gives a yellowish bead.

It was furthermore observed that the films dry to a more brittle and harder skin than is the case when lead oxide is used.

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