The invention relates to an apparatus for treatment of histological samples. The apparatus includes at least a working station, in which the sample gets into contact with a liquid reagent. Further, the apparatus includes a purification device, which blows off at least a part of the reagent adhering to the sample and/or the sample holding arrangement by means of a gas flow, or which sucks off at least a part of the reagent adhering to the sample and/or a sample holding arrangement.