PEACTICAL EXPEEIMENTS. 53 which is about eighteen inches in diameter, the circles at the ends of the six diameters are colored papers selected from the Bradley coated papers, as approximating the true complemen- taries. In the majority of cases they are not far from correct, but are least… … Fia. 14. there is as yet no blue pigment in the market suitable for com- mercial use which is free from a slightly violet effect. Therefore the standard blue paper is practically as good a complementary for the standard yellow as the violet blue paper. But notwith- standing these slight…
Color
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