For dry ice you use dried cured product. Take a half pound or so of dry ice pellets and about 4 to 5 oz of cured tops or trim. Then let it sit in the dry ice for about 5 minutes. You are freezing the tricomes. Then I put my bag over the clean food grade 5 gal. bucket and start to shake. The bucket catches the kief preventing it from blooming all over the room. When you have run this until you start to see green then stop. Use a credit card or a plastic putty knife to collect the kief. After that follow Frenchie's instructions on youtube to press it into tiles.