Need advise -white residue on meth pipe stem

[Tt64]

I scrape the white residue from the stem of my meth pipe. I have collected a good amount of this stuff. But i dont know if there is anything i can do with it. What is it? Is it good stuff, bad stuff, cut?

 

[Bearlove]

It has a good chance to be unsmoked meth - there is a thread about it here