| The calx of cobalt is of a deep blue colour, which, when fused, makes the blue glass called smalt. |
| It was observed very early, that when a metal was converted into a calx, its weight was increased. |
| This calx is soluble in about eighty times its weight of cold water, or in fifteen times its weight of boiling water. |
| The calx combines with a flux containing phlogiston-rich materials. |
| By long standing, or the addition of water, the calx of tin is precipitated from the solution. |
| The calx of acid is used in a variety of the arts, especially in the manufactory of glass. |
