Mystery story research

Hello,

I am writing a murder mystery and have questions about detecting the presence of tubocurarine chloride. If a nervous person accidently sprayed a bit on a painted/ wallpapered wall, would it leave a mark? Can you describe this mark, eg colour, and would it have an odour? Are there any household products with which an intelligent chemistry type could prove the stain (if indeed it leaves a stain) is tubocurarine chloride?

Thank you,

Valerie MacNeill