The reactions with microcosmic salt are the same as with borax.
The microcosmic salt bead dissolves almost every oxide except silica, SiO2, and this is seen to float about in the melted mass.
The presence of silica in a mineral can easily be ascertained by treating a small fragment in a bead of microcosmic salt.
Fused with borax, soda, or microcosmic salt, they give a clear bead.
microcosmic salt dissolves a large quantity of lime into a clear bead, which is milky when cold.
Baryta and its compounds produce the same reactions with microcosmic salt.
It does not melt with carbonate of soda, borax, or microcosmic salt, and is insoluble in every acid except the hydrofluoric.
Alumina and its compounds are slowly dissolved in the microcosmic salt to a bead, clear in both flames, and when hot or cold.
Many of the silicates give with borax a clear bead, while they form with microcosmic salt an opalescent one.
microcosmic salt does not dissolve so much zirconia as glucina, and is more prone to give a turbid bead.