polaroid emulsion (wet) transfer.
there is dry transfer where the dyes are transferred from the polaroid material to paper during development.
in this case the emulsion is lifted off the image/film base by soaking it in a hot water bath and then the paper is slid under the floating emulsion and lifted out of the water bath
info on the polaroid wbsite site about emulsion transfers
info on the polaroid website on dry/image transfers