Colorimeters are used to quantify the concentration of a solute in a solution by measuring the absorbance of a particular wavelength or color of light by the solution.

General view of a technician operating an electrostatic accelerator in the Dow Chemical Company's Spectroscopy Laboratory.

General view of technician Bill Beamer operating an unidentified machine in the Dow Chemical Company's Spectroscopy Laboratory.

General view of assorted equipment and apparatus used to conduct spectographic analysis at the Naval Air Material Center's Aeronautical Materials Laboratory.

General view of the Ultraviolet and Visible Spectrum (UV/Vis) Spectrophotometer used in the Naval Air Material Center's Aeronautical Materials Laboratory. UV/Vis spectroscopy is routinely used in analytical chemistry…

Employees Matt Quigley (left) and Tom Balchin (right) holding a copy of the "Crompton & Knowles Computer Fashion Shades" catalog. This photograph was taken at the Crompton & Knowles Customer Service Laboratory in…

Bruce Billman using a Perkin-Elmer Atomic Absorption Spectrophotometer to test the metal content of a dye solution. This photograph was taken in the Analytical Section Laboratory at the Crompton & Knowles Research…

View of the Library and Information Retrieval Quarters at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. Seated are researcher John King (left) and Elizabeth B. Hamf (Literature Chemist) at right.
…

View of a chemist in a two-person laboratory module for the synthesis and testing of dyes and chemicals at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania.

Based in Worcester, Massachusetts, Crompton…

Exterior of the new Crompton & Knowles Corporation Research Center in Gibraltar, Pennsylvania. The Research Center housed laboratories for research and development in dyes and chemicals for the textile, paper, leather,…

View of a secretary using a Termatrex Information Retrieval System at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. The system utilized punch-cards and a chemical identification code devised by…

View of Laboratory No. 4 at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. The photograph shows a typical laboratory layout, including bench arrangement for easy access to the outward-opening door.…

View of Laboratory No. 1 at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. The photograph shows a typical two-person laboratory set-up for a chemist and technician, including partitioned office space…

Research Director George Garcelon inspects a portable temperature monitoring and control device at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. The device was used to regulate chemical reactions as…

View of chemist Dr. James F. Feeman filtering a dye slurry into a filter sink at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. The sink, made entirely of polyethylene, prevented the breakage of…

View of chemist James F. Feeman using a portable pH meter, designed by the Althouse Chemical Company, in a laboratory at the Crompton & Knowles Research Center in Gibraltar, Pennsylvania. A special stirring table for…

Leo Labrecque using a Launder-O-Meter to test the wash-fastness of dyed fabric. Bottles containing a standard weight of fabric in a standard soap solution are visible both within and outside of the machine. During the…

General view of the Customer Service and Quality Control Laboratory at the Althouse Chemical Company plant in Reading, Pennsylvania. The employees visible in the photograph are, from left: Tom Margolillo; Dot Bowen;…

View of employee William White examining a Weather-O-Meter at the Althouse Chemical Company Customer Service and Quality Control Laboratory in Reading, Pennsylvania. To the left of the Weather-O-Meter are two…

View of Warren Crowther removing a skein, a length of yarn wound in a loose coil, from the cylinder of a pressure-dyeing machine used for the application of colored dyes. This photograph was taken at the Althouse…

View of Thomas Manzolillo examining a roller used to hold fabric in place for the application of dyestuffs. In this typical dye process, fabric is rolled through a trough of dye and then pressed between two heavy…

General view of the Printing Department at the Althouse Chemical Company Customer Service and Quality Control Laboratory in Reading, Pennsylvania. Omer Bixler (left) is seen cutting fabric samples while technicians near…

General view of the Printing Department at the Althouse Chemical Company Customer Service and Quality Control Laboratory in Reading, Pennsylvania. Omer Bixler (left) is seen cutting fabric samples while technicians near…

View of James Feeman (left) and George Garcelon (right) operating assorted equipment for the application of dyestuffs. This photograph was taken at the Althouse Chemical Company Customer Service and Quality Control…

View of dyeing technicians working in the Customer Service and Quality Control Laboratory at the Althouse Chemical Company plant in Reading, Pennsylvania. The technicians are engaged in a skein dyeing process whereby…