It is the viscous or graisse disease.
free from bubbles, it is allowed to cool down to a certain extent so as to become viscous or pasty.
The solid melts to a pale yellow liquid which on continued heating gradually darkens and becomes more viscous, the maximum viscosity occurring at 180°, the product being dark red in colour.
Liquid selenium becomes more and more viscous in character as its temperature falls from 220° C. to 60° C.; it is soft at about 60°, but is hard and brittle between 30° and 40°.
The more viscous descriptions of mineral oils have also been found suitable for use in the Elmore process of ore-concentration by oil.
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