Abstract: An apparatus for the colouration of textile materials with a gaseous stream containing a dyestuff, or dyestuffs, in vapour form, which comprises means for passing a hot stream of inert gas over a dyestuff and means for allowing the resulting stream of gas containing dyestuff vapour to impinge on the textile material, in particular an apparatus comprising a reservoir for containing an inert gas under pressure, said reservoir being connected to a tube fitted with heaters, said tube containing a receptacle for the dyestuff, and the other end of the tube being fitted with a jet from which issues the stream of inert gas containing a dyestuff vapour. The apparatus is preferably used for colouring synthetic textile materials with volatile Disperse Dyestuffs.