If you are even curious about rosin, check this out. Even if you just scroll for photos to get an idea of whats possible. Lot of good info though.
While previous posters are right that it is best practice to freeze dry the bubble or dry sift before pressing into rosin, it absolutely not a requirement to produce quality product. I think it is more geared toward commercially minded producers. Since this is not for a commercial venture, who cares if the color isnt the absolute lightest if the quality is good?
I have not tried this, but if you insisted on the very best and wanted to freeze dry, you could test a cheaper option:
