KLAUS GULDBRANDSEN / SCIENCE PHOTO LIBRARY KLAUS GULDBRANDSEN / SCIENCE PHOTO LIBRARY
Washing powder research. Technician with a flask of dye beside a vat used to make standard chemical dyes for staining cloth during washing powder tests. The washing powders will be tested to see if they can remove a variety of standard stains from textiles without damaging the material. Washing powders, like all detergents, work because their molecules have one end that becomes attracted to water whilst the other attaches itself to grease. The washing powder molecules attach themselves to greasy dirt particles on the cloth before pulling them away into the water.
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