After i use ThaumcraftApi.addCrucibleRecipe() to register a recipe, i still can't recipe them in a crucible, even if i have already researched this research page and can see this recipe in the book.
version: tc 4.2.3.5

Can you post your code please?

sorry, but i found that i didn't understand the meaning of "key" in addCrucibleRecipe() so i used a wrong string to register my recipe, so my registry didn't work. thanks anyway.