I think it would be the different printings. Older ones usually are solid colors, while the newer ones I have seen are brown with some patterning on them. The colors denote who they are given to: brown is for personal witnessing, red is for 5th grade, green for college students, orange for sidewalks off school property, blue for service, white for nursing and medical employees, camo for armed services either green or brown camo. It helps in ordering for the different distributions.
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military- black universities- orange schools- red hospitals- white brown
frequencies
Enough.
Refraction is when light bends through an object. White light is made up of all the colors of the spectrum. Different colors have different wavelengths, therefore they bend at different angles. So when white light passes through a prism the different colors bend at different angles, so they separate to produce the rainbow of light that we see.
there are many colors