An incrustation of salt on the window.
A metallic globule with or without an incrustation may be obtained.
Gold and copper salts give a metallic bead without an incrustation.
All the large and some of the small islands appear to be composed of ancient volcanic rock, with an incrustation of coral limestone showing here and there along the coast.
- Many lichens, as is well known, exhibit a vivid colouring which is usually due to the incrustation of the hyphae with crystalline excretory products.