Such cases should be registered for further examination, taking note of the miscalled colours. It would be an additional precaution to change the position of the colours in the windows of the apparatus, in order to prevent the association of colours with their positions as first given in the instructions. _Note._--The paints which most nearly correspond to the colour standards in the Colour Educator are tabulated below, the third column containing their measured colour proportions when they are washed thickly on white paper (_Whatman’s_). --------------+---------------+----------------------------------------------- | | Colour Composition in Standard Units. Spectrum | Artists’ +-------+-------+-------+-------+-------+------- Names | Names. | | | | | | | | Red. |Orange.|Yellow.| Green.| Blue. |Violet. --------------+---------------+-------+-------+-------+-------+-------+------- | | | | | | | Dominants: | | | | | | | Red | Crimson Lake | 18·0 | 0·4 | ---- | ---- | ---- | ---- Yellow | Lemon Yellow | ---- | ---- | 6·6 | ---- | ---- | ---- Blue | Cobalt | ---- | ---- | ---- | ---- | 9·0 | ---- | | | | | | | Subordinates:| | | | | | | Orange | Chrome Orange | ---- | 7·2 | 1·6 | ---- | ---- | ---- Green | Emerald Green | ---- | ---- | 0·40| 5·4 | ---- | ---- Violet | Mauve | 3·3 | ---- | ---- | ---- | ---- | 8·2 --------------|---------------+-------+-------+-------+-------+-------+------- In mixing two dominant colours (artists’ primaries) to develop subordinates (artists’ secondaries), their relative colour depth must be taken into account; for instance, Crimson Lake has a natural colour depth nearly three times that of Lemon Yellow; therefore, in order to develop a normal Orange nearly three times the quantity of Yellow must be used, presuming that they were originally ground to an equal degree of fineness. It is desirable that a record of the children’s own painting should be preserved, with a view to discriminating between errors arising from Colour Blindness and Colour Ignorance, the former perpetuating itself, and the latter naturally remedying itself. For this purpose painting books containing sets of diagrams corresponding to the figures in the foregoing pamphlet can be supplied. Appendix II THE POSSIBILITIES OF A STANDARD LIGHT AND COLOUR UNIT.[5] [5] Reprinted from the _Journal of the Society of Dyers and Colourists_, March, 1913. No. 3, vol. xxix.