The Double Crusher works on two items at the same time.
Allium → 3 × Magenta Dye
Azure Bluet → 3 × Light Gray Dye
Black Quartz Ore → 2 × Black Quartz
Blaze Rod → 3 × Blaze Powder
Blue Orchid → 3 × Light Blue Dye
Bone → 6 × Bone Meal
Block of Coal → 9 × Coal
Coal Ore → 3 × Coal
Cobblestone → Sand
Copper Ore → 2 × Raw Copper + Raw Gold (5%)
Cornflower → 3 × Blue Dye
Dandelion → 3 × Yellow Dye
Deepslate Coal Ore → 3 × Coal
Deepslate Copper Ore → 2 × Raw Copper + Raw Gold (5%)
Deepslate Diamond Ore → 2 × Diamond
Deepslate Emerald Ore → 2 × Emerald
Deepslate Gold Ore → 2 × Raw Gold
Deepslate Iron Ore → 2 × Raw Iron + Raw Gold (20%)
Deepslate Lapis Lazuli Ore → 12 × Lapis Lazuli
Deepslate Redstone Ore → 10 × Redstone Dust
Diamond Horse Armor → 6 × Diamond
Diamond Ore → 2 × Diamond
Emerald Ore → 2 × Emerald
Glowstone → 4 × Glowstone Dust