Glass Spectrum
Glass Spectrum
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 New Sealed DERWENT 36 Difft Studio Colored Pencil Set  US $24.99
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 BLACKLIGHT UV PAINT BRIGHT FIERCE GLOW INVISIBLE WHITE US $23.95
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What is the best prism for the brightest spectrum, an acrylic prism, a glass or plastic. What's the difference
Glass I think it needs to be crown glass instead of flint glass
