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Judging dyed skeins
Determining the drying time of lacquer
A 'quartz fingernail' used to determine hardness of paint films
Determining the degree of gloss
Testing resin at Marshall Laboratory in Philadelphia, Pennsylvania
Testing stencil paste
Determining the melting point
Determining a chemical reaction
Chemists study slide before a background of photomicrographs
Nobel prize winner Professor Peter Debye addresses a group of DuPont scientists
Employee at work at the Haskell Laboratory of Industrial Toxicology
Lab consultations at E.I. du Pont de Nemours & Company laboratories
Employees of the Haskell Laboratory of Industrial Toxicology

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