How can i tell if this stain on my ceiling is blood or not?

Question

i was taking stuff off of my ceiling and noticed a brown/red stain and am worried its blood or something haha. is there any way of knowing what it is? its probably just soda or could be mold?

Answer 1

Put some hydrogen peroxide on it. If it bubbles then it's blood.

Answer 2

Using ultraviolet lamp, the saliva, s***n, sweat and blood, appears shiny under ultrtaviolet light.

Answer 3

Its probably a water stain.  It could be either from moisture or humidy, or maybe a slow leak from above.  My roof leaked and the water stains on my ceiling were brown and looked like dried blood at first.