This wax is made by umites, a variety of sprites, who live in hive-like communities in the rainforests of the world. The wax is used to make magical candles and markers. When properly enchanted, these items can be used to send and receive sensitive messages and to secretly mark tails. A message written in umite is invisible to the eye until illuminated by the flame of a umite candle; the massage is impossible to erase.
It isn't easy to come by and can not be found without the candle.