Is there any substance that reveals blood place on a surface after being cleaned?

0 ⤊

Is there any substance that reveals blood place on a surface after being cleaned?

like the precedure to reveal fingerprints

2007-08-22 08:22:04 · 2 answers · asked by sadimani 1 in Science & Mathematics ➔ Chemistry

2 answers

Ultra violet lights are used to find blood/urine/semen stains.

2007-08-22 08:29:37 · answer #1 · answered by moonbeam 3 · 0⤊ 0⤋

The police have a powder that shows remnants of blood under black light. Nothing really cleans off human blood so that it's undetectable...you'd be surprised how it splatters and how many nooks and crannies contain traces of it.

2007-08-22 15:30:18 · answer #2 · answered by Jess 7 · 0⤊ 0⤋