TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable TI - Coupling tubs at the Althouse Chemical Company plant ID - vq27zn42r AU - Tenschert Commercial Photo Studio DA - 1946/// YR - 1946 AV - Photographs from the Records of the Althouse, Bates, and Crompton Chemical Companies, Box 1 VL - Photographs from the Records of the Althouse, Bates, and Crompton Chemical Companies, Box 1 AN - Photographs from the Records of the Althouse, Bates, and Crompton Chemical Companies, Box 1 UR - https://digital.sciencehistory.org/works/vq27zn42r AB - General view of the coupling tubs used for the manufacture of azo dyes at the Althouse Chemical Company plant in Reading, Pennsylvania. In a typical manufacturing process for azo dyes, coupling tubs are recessed in the floor, as seen here, with tubs of diazotized amine solution positioned above. After the diazotized amine solution flows into the tubs and coupling occurs, a precipitated dye slurry is transferred to blowcases on the floor below and blown through filtration equipment to produce dye cake. Based in Reading, Pennsylvania, the Althouse Chemical Company was founded in 1915 by C. Scott Althouse (1880-1970) as a small, family-owned firm specializing in fabric dyes of a superior quality and class. In 1954, the Crompton & Knowles Corporation of Worcester, Massachusetts acquired Althouse, which continued to operate as a division of Crompton & Knowles and a leader in the specialty dyes industry. KW - Dye industry KW - Dyes and dyeing KW - Dyes and dyeing--Equipment and supplies KW - Althouse Chemical Company LA - ER -