The beautiful crystallised mineral called chrysolite is a silicate of magnesium, coloured with ferrous oxide.
Invariably there is among these a formula for ferrous oxalate developer.
ferrous sulphide is sometimes found in nature as a golden-yellow crystalline mineral.
Calculate the value of the ferrous salt in terms of bichromate.
Ferric oxide gives a yellow colour, but requires the presence of an oxidizing agent to prevent 87 reduction to the ferrous state.
Fig. 121 shows us, also, what are the conditions under which the reduction of ferric to ferrous oxide by carbon can occur.
The bark possesses tanning properties, and in Scotland in past times yielded with ferrous sulphate a black dye for wool.
ferrous oxide is obtained when ferric oxide is reduced in hydrogen at 300 as a black pyrophoric powder.
ferrous salts give a greenish precipitate with an alkali, whilst ferric give a characteristic red one.
The solution, in common with those of most ferrous salts, absorbs nitric oxide with the formation of a brownish solution.
ferrous fer·rous (fěr'əs)
Of, relating to, or containing iron, especially with a valence of 2 or a valence lower than in a corresponding ferric compound.
Containing iron, especially iron with a valence of 2. Compare ferric.