Again, ketones have no effect on this reagent. These derivatives have very large molar masses and consequently have high melting points. They are also brightly coloured either orange or red. The overall reaction is an addition-elimination process, with water being the molecule removed from the reactants. These derivatives have very specific melting points and this fact can be used to determine the original aldehyde or ketone used to form the derivative.
Triiodomethane is a straw yellow solid, insoluble in water.