Luminous Paints.

Manufacturer and Builder 5, 1893

A yellowish-brown luminous paint is obtained from 48 parts varnish, 10 parts precipitated barium sulphate, 8 parts auripigment and 34 parts luminous calcium sulphide.

Luminous colors for artists' use prepared by using pure East India poppy oil in the same quantity instead of the varnish, and taking particular pains to grind the material as fine as possible.

For luminous oil-color paints equal quantities of pure linseed oil are used in place of the varnish. The linseed oil must be cold-pressed and thickened by heat.