Aleuromancy is reading fortunes with flour. It’s an old art, and the flour itself can be read in various forms, dry or wet, or secrets are wrapped in dough, to be discovered by the person affected. A present day example is the Fortune Cookie.
Aleuromancy and Alomancy are not identical systems. Alomancy involves reading salt crystals, in some respects like Tasseography (tea leaves.)
We Rhinos have tried to make sense of it, but We seem to lack the knack. We mostly just make a mess.