Answer :
Final answer:
The ASTM codes rate the lightfastness of colors, with ASTM II indicating very good lightfastness.
Explanation:
The ASTM (American Society for Testing and Materials) codes are utilized to rate the lightfastness--or how well a color holds up under exposure to light--of colors used in art mediums. The ratings range from I to V, with I indicating excellent lightfastness, II indicating very good lightfastness, III indicating fair lightfastness, IV indicating poor lightfastness, and V indicating very poor lightfastness. Therefore, the correct answer to the question, 'which rating indicates very good lightfastness?' is ASTM II.
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