That process would be solventless
But that’s not How that’s made
Just instead of putting into a mold you melt it into a sheet and then cool off and break into chunks
How clean you get the isolate will change the color of the “diamonds” but they tend to oxidize unless mixed back into the terp fraction
The bubbles are a sure sign of the Tek, hard to get rid of all of them without just taking the whole chunk out the pile