no it isnt. it means that the rank of the item has risen 3 levels.
If its a negative mark: its a fail.
You can calculate with it if you _really_ need an alchemy book to do the compound yes or no, and the possibility to get the item.
EG: primary+3: no alchemy book needed, but it has to rise 3 levels (4=max) thus the compound will come out less then for example a primary+1 compound.
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