Capitalization of adjectives with prefixes

Prefixes attached to a proper adjective are not capitalized unless the prefixes themselves are formed from a proper noun.

1. What adjectives should be capitalized?
2. Do you capitalize proper nouns when used as adjectives?

What adjectives should be capitalized?

Adjectives made from proper nouns are "proper adjectives" and also need to be capitalized. Proper nouns are nouns that refer to unique places, people or organizations.

Do you capitalize proper nouns when used as adjectives?

A proper noun is the specific name of a person, place, organization, or thing. All proper nouns (as well as adjectives derived from them) should be capitalized.