How would you make the light stronger (to see the yuckies better)?
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As a side note, don’t get too grossed out at first glance… Not everything will necessarily be a bodily fluid:
Biological stains: saliva, semen, urine and blood
Laundry stains: dried liquid detergents
Club soda and all liquids containing quinine
Invisible ink made from lemon juice or similar compounds
Toothpaste with whiteners that fluoresce
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