Does the color of crayon affect it's melting rate?
The answer to this question most likely has to do with the
albedo of crayon (wax, charcoal, etc). Albedo is the extent to
which an object diffusely reflects light from light sources,
measured as a ratio. The lower the albedo, the more light/energy is
absorbed into the object. Since darker colored objects absorb more
energy, the albedo of a darker crayon is probably lower than the
albedo of a lighter crayon. This means the darker crayon, while
absorbing more energy, will heat up faster than the lighter
This is why snow around a tree typically melts much faster and
earlier than snow with nothing around it -- because of the tree
bark's albedo is much lower than snow/ice and thus can absorb more
energy faster, and heat up whatever is around it quicker.