Fig. 3 Effect of static heat exposure over time on (A) Munsell hue, (B) Munsell value, and (C) Munsell chroma. Alphanumeric Munsell hues were converted to numerical values by using a Munsell hue circle (Chamberlin and Chamberlin, 1980). With this conversion 5YR = 15, 5Y = 25, and 5GY = 35