In using a "white spotlight" and a "red spot" light, use the white spotlight to enhance a figure, and the red spot to enhance a setting Sun, or a bonfire. I use red flood lights to enhance a setting Sun or to create a "warm" glow to a picture, and a blue light to create a late evening or moonlight effect to a picture.
Also, it is possible to produce a permanent picture (not for presentation in a program) using only a blue chalk, and a red chalk, and black light chalk. Under blue light (to simulate a night scene) you can draw (using red chalk) a group of shepherds around a fire, with a flock of sheep, and either a star, or angels singing, or the holy family around a manger in a stable open to moonlight.
Under a red light draw (using blue chalk) to simulate Jesus on a cross with two thieves in the background. Under black-light draw (using black light chalk) to have the resurrection, or the second coming.
Under ordinary room light, it would be a jumble of color (blue, red and white) that would make very little sense, but under blue, or red, or black-light illumination there would be three distinctly different pictures.
(from Chalk Art News, May, 2009: http://www.chalkmart.com/custom/index.cfm?id=178122&CFID=31065057&CFTOKEN=97040242&jsessionid=9830f4ef7de6b6bc12eb436866502d44b536 - posted with permission)
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