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 Added interest may be excited by showing similar models in several other colors during the same lesson, thus avoiding the possible impression on any mind that the term tint and shade apply to any special color.

Tints and shades may also be shown very beautifully by some kinds of colored materials. Colored satin ribbons, folded or crumpled, and velvets and plushes give good object lessons. One of the most effective exhibitions of tints and shades may be found in a material used for upholstering furniture and technically called "crushed plush," which is a worsted plush embossed in figures and very changeable in its effects as its relation to the light is changed, giving at the same time very light tints and very dark shades in different portions.

Having thus shown how real tints and shades in nature are produced, the color wheel may be introduced with advantage. If it were practicable to use opaque colors in the school they could be employed to show that the effect of a tint is produced in pigments by mixing white with the standard color and a shade" by mixing black with it, but while the mixture of white may produce the best imitations of some tints in nature, the same result does not hold good in the use of black to form shades, and black pigments are rarely used for this purpose, because they impart various untruthful hues, according to the colors with which they are mixed.

For this reason, and others which will appear later, the white and black disks of the color wheel are found to be better than any other single method for representing tones. In shades the black disk produces by far the best imitation of nature, and so does the white disk for more than half of the colors. But, as previously stated, there is an effect which has never been satisfactorily explained by which the tints of red and blue especially receive an unexpected violet gray tinge by rotation. Therefore in showing tints on the wheel it is well not to show very light tints of red or blue until the class has received some impressions of tones in other colors. In the orange and violet