Chemistry Discoveries
In addition to his mechanical work Murdoch also experimented in the field of chemistry and made a number of discoveries. One such was the discovery, first recorded in 1784, of iron cement made from sal ammoniac, or ammonium chloride and iron filings, apparently discovered when Murdoch observed that these 2 components had accidentally mixed in his tool bag and formed a solid mass. This iron cement was used to fix and harden the joints of steam engines, thus creating a hard durable seal.
Another discovery, and the first for which Murdoch took out a patent was that of
The art or method of making from the same materials and by the same processes entirely new copperas, vitriol, and different sorts of dye or dying stuff, paints and colours, and also a composition for preserving the bottoms of all kinds of vessels and all wood required to be immersed in water, from worms, weeds, barnacles, and every other foulness which usually does or may adhere thereto.
This patent was filed in 1791 and although it was not developed at the time this can be seen as the first step in the development of aniline dyes and coatings.
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