WHEN RED SEEMS BLACK.

Pukekohe & Waiuku Times, Volume 5, Issue 227, 17 November 1916, Page 4 (Supplement)

WHEN RED SEEMS BLACK.

SOUK CURIOUS COLOUR FACTS. A volume oil " Colour and Its Application," by M. Luckiest'h, which has been recently published, contains some little known facts regarding colour audi colour iihiiions. A colour may be affected by nine different factors, and changed from its original appearance so much that the human eye will see things that are not present. For instance, hold a piece of red paper at arm's length so that the light troni a window will be tuH upon it. Put behind the red paper a large piece • I kreen and move the two m horizontal I:nes with the eye fastened eloseiy upon the red patch. The latter will seem to vibrate and to move aimlessly and independently of the green. A colour varies according to tlie illumination upon it. A green hir."> will tend toward blue r.s in the sunlignt and black when seen under a blue oi green Humiliation. Very few fabrics apepar blue under electric or gas lights be: .iuse there are not blue rays from such illumination centres.

If the eye is fastened steadily upon a white surface in the sunlight immediately after staring upon some brilliant-iv-coloured objects, it will behold th«i images of tliose objects clearly at first, then with increas'.ng dimness, lading gradually through a series of colours, IJu-j grron. indigo, violet, p:nk, dark orange, and so oil, until they tade Irom si«rht. If the eye has stared lengthily upon a red surface, and then suddenly shifted it to green, the intensity of the latter will he, groatlv enhanced for th? first few moments. Painters take the various applications of this 'aw snto account.