Gray is the color between black and white and it can be created in many ways. There is cool gray and there is warm gray. There are light grays and dark grays. The question is, how do I make the right gray? Do I add one percent black to white or 99 percent white to black? Asks a contributor. As an art teacher, I can give my students a written test to see if they remember the formula, or I can give them a paintbrush and paint. Standardized tests are supposed to be more acceptable than non-standardized tests. They...

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