When two or more adjectives are used in a list the question arises: should they be separated by commas? There are no clear-cut rules about this but the following guidelines may help.
No comma is needed to separate adjectives of different types, e.g. a qualitative and a classifying adjective:
a big black dog
Use a comma between two or more qualitative adjectives:
Long, slender legs
If the adjectives are all classifying adjectives, use commas if the adjectives all refer to the same class:
English, French, and Spanish editions
a tall, conical lid
Otherwise do not use commas:
Italian Renaissance architecture.
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