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boron sulfide is a yellow to white crystalline solid, other names are B2S3 and boron trisulfide. It turns into a paste after heating and resolves in moist air. It is faintly soluble in phosphorus trichloride, sulfur dichloride and alcohol and tends to hydrolyze.

It is a good antiseptic and is used in eye lotions, in solutions for electroplating nickel, or in tanning leather. It is also a good catalyst in many organic chemical reactions.

When boric acid is heated, it loses water to form metaboric acid, HBO2. Then, further loss of water results in the formation of boron oxide, B2O3. It has many industrial applications including as a mild antiseptic for burns and surface wounds, as a fire retardant in fabrics and in solutions for electroplating nickel or for tanning leather.

Unlike most sulfides, it can be dissolved in water (hence its name).

It is about twice as soluble as carbon dioxide.
It can be found in a variety of foods and is an important component in some medicines. It is toxic to mammals and is about half as flammable as hydrogen cyanide.

When you breathe hydrogen sulfide, it smells like rotten eggs and it kills you. The strong smell and the fact that it has no taste make it a great poison.