1. Of black tinged with blue
   - blue-black

See also: achromatic, neutral

• family Adiantaceae
• family Aegypiidae
• family Aepyornidae
• family Agamidae
• family Agaricaceae
• family Agavaceae
• family Agonidae
• family Ailuropodidae
• family Aizoaceae
• family Akeridae
• family Alaudidae
• family Albuginaceae
• family Albulidae
• family Alcedinidae
• family Alcidae
• family Aleyrodidae
• family Alismataceae
• family Alliaceae
• family Alligatoridae
• family Allioniaceae
• family Aloeaceae
• family Alopiidae
• family Alstroemeriaceae
• family Amaranthaceae
• family Amaryllidaceae