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A comment on The Difference Between ‘Violet’ and ‘Purple’ (2015). Parent comment

Re:The Difference Between ‘Violet’ and ‘Purple’ (2015) by OscarCunningham on Wednesday April 03, 2019 @01:51AM (#19561082)
Because the light that blacklights emit is on the longer end of the possible UV wavelengths. This is what the UV-A means. There are also UV-B and UV-C with shorter wavelengths.
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