The MCT oil is pharmaceutical grade, the GSO just says filtered and sterile. I got both from the same site that sells home brew stuff, I know that it can still be trash. All the other stuff like ba, bb, EO guiacol just says USP.
I usually put powder, ba, bb in one beaker and carrier in a separate one. I put both in a shallow pan with about an inch and half of water. Both get heated the same at the same time.
After I wrote the post I realized a better description is an opaque film like almost a thin film/skin of "dirty." It's like thinner than paper and it's in the center on the top of the solution, it doesn't go all the way to the walls of the beaker. It shows up on powder ba and bb beaker after I have let it sit in the warming water. It forms during that period where I have placed them in water and the stove is heating up, I don't stir during this time until I get up to around 150-160f. Once I start stirring it obviously gets mixed back into the solution. It's almost like the reverse of something settling out of the solution but it's at the top on top of the solution.
As far as my raws go, and I know it's not the top tier supplier but they claim 98% or better with most above 99%.
So far I have seen the film on some DHB cypionate I brewed at 125mgs and two batches of test enanthate at 300mgs. All batches have been at 100ml.
I have other hormones like tren e, mast e, EQ, npp but I have been holding off because of the film. Like I wrote I remember reading about the film but I can't find the place I read about it. If I knew that my 0.22 filter was catching the stuff I wouldn't worry about it but I don't know. Overall I have not noticed anything odd about the stuff I did brew and pin.