Friend, J. Newton (John Newton), 1881-1966 · London, New York : Longmans, Greens · leaf 217
Colouring Power, — This is tested by comparison with a standard pigment, by mixing varying amounts with a definite quantity of some white pigment such as china clay, until the same tint has been secured as by the use of a known weight of the standard pigment with the same amount of china clay. Thus… … are pale, white if they are dark), Fig. 20. and flattening them carefully down with a palette knife until the two surfaces just meet along a line, but do not amalgamate (Fig. 20). By placing in a good light, a perfect comparison can be made. 10. The Testing of Driers. — This has already been dis¬…
Paint · Chemistry, Technical
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