The present invention renders an electrophoretic membrane having a molecular weight range from 10,000 to 150,000 transparent by first impregnating the membrane with a lower alkyl alcohol and thereafter treating the membrane with an ether until the membrane becomes transparent. The temperature of the solvent liquids generally ranges from 10.degree. to 35.degree. C.
A support for electrophoresis comprising a porous polymer film having an electroendosmosis factor of 0 to plus about 10 mm, and a process for the production of the support comprising adding a nonionic surface active agent and/or cellulose ether to a mixed solution comprising at least a polymer material for formation of a film and a solvent to produce a porous polymer film.
An apparatus for dyeing and decolorizing a specimen carrier of, for example, paper film carrying a plurality of specimens such as blood serum to be analyzed which have been treated by means of an electrophoretic apparatus, comprising a mechanism for transporting and holding the specimen carrier, a dyeing trough containing a dyeing liquid agent, a decolorization trough containing a decolorization liquid agent, and a trough drive mechanism for successively moving the dyeing and decolorization troughs, whereby the troughs are respectively moved with respect to the specimen carrier held by the transporting and holding mechanism up to the position where the specimen carrier is dipped into the liquid agent.
