Well, this isn't the first I've heard of doing this. Way back in the day I knew someone that would add the benzocaine to crushed generic white methylphenidate tabs and sold it as coke. I also knew someone that had a bad coke habit that would add it to their ground up pseudo. She really just wanted to feel a numbing drip.....atleast that's what I think she wanted. I'm only speculating about her motives. I don't recommend pulling the trickery I mentioned as the first guy eventually got his face broken with a jack handle for passing that stuff off as blow. Personally I love Ritalin but there is quite a difference and a veteran of the white stuff will know it's not right. Not that you were thinking of doing this.