Bleaching earths
There are two types: (1) fuller’s earth possessing absorptive properties in the natural state, (2) activated clay in which the absorptive powders which are low in the raw state are enhanced by hear or chemical treatment (usually a mild acid leach).

Blue print paper
Light sensitive paper (turns blue) impregnated with [Fe(CN)3]3- and iron(III) citrate of oxalate. The paper is fixed by washing with water. Brown print paper is having a metal (Pt, Pd, Au, Hg, Cu) salt and Fe(III).

Boat conformation
A boat-shaped conformation in space which can be assumed by cyclohexene or similar compounds; a relatively unstable form.

Blende, sphalerite
ZnS, generally contains some Fe which gives a dark colour.

Blister copper
Copper (96.99% purity) produced by the reduction and smelting of copper ores.

Blue tetrazolium
C40H32CI2N8O2, lemon yellow crystals that decompose at 242-2450C; soluble in chloroform, ethanol, and methanol; used in seed germination research, as a stain for molds and bacterial, and in histochemical studies. Also known as dimethoxy neotetrazolium; ditetrazolium chloride; tetrazolium blue.

Blue vitriol
Copper (II) sulphate pentahydrate (CuSO4. 5H2O)