Answer:
blue
The range of cool colors is varied – green to yellow and violet. The coolest of all is blue. They are more subdued in their appearance; hence they belong to this family
Based on the color wheel, we notice that some colors or their shades give us a feeling of warmth or coolness. Blue represents the coldest area in front of the orange (complementary color of blue see complementary colors) which, in turn, is the hottest sector.
