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Underwater, red rays filter out the quickest and fade out entirely at a depth of 14 feet. Orange and purple rays disappear below 45 feet. Yellow is visible to 90 feet, green to 110 feet, and blue to 180 feet. Colors below their visibility range show as grey or black.
Thanks, limnology.
If red line supposedly works so well for this reason, why not just use greyish black line?
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