It is a resinous mixture obtained by bees from the buds of trees, exuded sap or other plant sources and then process them in the hive as a sealing small holes (6 mm or less), sometimes mixed with wax and varnishing the whole interior of the hive. For larger holes, use bees wax. The color of propolis depends on the source from which it was obtained, the most common being dark brown. At 20 degrees C, propolis is sticky and solidifies lower temperatures.