Popular Science, tammikuu 1883
The fact than an aniline black can be formed with vanadium has provoked investigation into the feasibility of the production of that metal for commerce. MM. Osmond and G. Witz have found a considecrable source of supply in the foundry-scorias of Creuzot, France, which contain two per cent of vanadic acid. The scorias have only to be treated with hydrochloric acid to obtain from them a green liquor which can be used directly in dyeing.