Meth Different colored stains in pipe?

[cletusSamboy]

Normally I get small white or small black patches in the pipe or often nothing. This time I got light brown/tan patches on the pipe. Does fent laced meth normally leave light brown or tan stains?

 

[Zopiclone bandit]

Unless it is Pure Meth who knows what it is cut with, it could be anything.
Back in the last UK Heroin drought our tubes would turn Neon Green & the "stuff" would taste like TCP, what the fuck was that? Nobody knows.

Also I have to add I've never smoked Meth & have NO desire to BUT if it was cut with Fent surely the effect would be kinda equal to shooting Crack & heroin together in a way? I'm sure Fent would overpower some bashed up Meth?