MODEL RELEASED. Chemistry. Female chemist pouring a blue liquid from a measuring cylinder into a flask in a fume cupboard. The flask will be attached to the bottom of the rotary evaporator (upper left) which encourages evaporation of the solution so that crystals form in the flask. Evaporated liquid is condensed into another flask at lower left. The fume cupboard draws away any harmful gases given off by the solution. The chemist is wearing a protective face mask and rubber gloves.