Propolis, or bee glue, is greenish, greenish-brown, brown, yellow-brown or reddish in color with a pleasant peculiar smell reminiscent of poplar buds, wax or vanillin. On warm days in the hive it is soft and sticky, in the cold — hard.

Propolis composition: the main components of propolis: vegetable resins, essential oils, aromatic substances. Propolis dissolves in alcohol, oils, water is not soluble.