Well, when you figure it out, remember that it is colorless when applied to most surfaces, like, for instance, toilet seats.... It is only when transferred to damp skin that it turns blue. Wife and/or girlfriends have a hard time dealing with a blue bum, ha ha!
Thanks for the tip, but I'd have to hide my guns... the girlfriend would SLAUGHTER me!
And if she didn't literally kill me, I'm sure that the least of my problems would be no foolin' around for t_skoz until Hell froze over. However, she's Irish like me... we hold grudges and SHE WOULD GET ME BACK!
I think I'll save this for someone besides the girlfriend...