It is only by years of experience that some of these colourings can be detected.
For ornamental work lacquering divides favour with colouring - sometimes done with coloured lacquers, but often with chemical colourings, of which the copper and iron salts are the chief basis.
As early as 1861 gold discoveries were made on the Stikine river; repeated discoveries, culminating in the Cassiar district "boom," were made in British Columbia from 1857 to 1874; colourings along the Yukon were reported in 1866-1867 and systematic prospecting of the upper river began about 1873.
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