Bob Switzer

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For the American congressman, see Robert M. Switzer.

Robert C. Switzer, usually known as Bob Switzer, (19 May 1914 – 20 August 1997) was an American inventor, businessman and environmentalist. Bob was co-inventor of the first black light fluorescent paint along with his brother Joseph Switzer and the inventor of the Magnaglo process for nondestructive flaw-detection in machined parts. The brothers founded the Day-Glo Color Corp. in 1946 to develop and manufacture fluorescent paints, pigments and other products.


Early life[edit]

Bob Switzer was born in Fromberg, Montana, to parents Maud (Slocum) and Emmet Switzer and was raised in Berkeley California.[1] In 1932, he received a scholarship from the Scaife Scholarship Foundation of Oakland, California, so he attended the College of Chemistry at the University of California, Berkeley, in hopes of becoming a physician.[2]

During the summer of 1933, while working to unload tomatoes from a freight car at a H. J. Heinz Company laboratory in Berkeley, California, Bob fell and suffered several serious injuries, including a skull fracture and severed optic nerve. Doctors told him to stay in a dark room until he recovered his eyesight, a period which lasted several months.[3]


While convalescing from his injuries, Bob and Joseph searched for fluorescent materials, which Joseph had read about and wished to use in his amateur magic shows. The brothers inspected various products from their father's pharmacy, using a black light to identify fluorescent compounds. After Bob's recovery, the brothers continued to experiment with these, mixing them with shellac and eventually succeeding in producing the first black light fluorescent paints. They founded the Fluor-S-Art Co. in 1934 to develop and market their products for advertising displays.[2][3]

The brothers moved their company to Cleveland, Ohio, to partner with Continental Lithograph, a subsidiary of Warner Brothers Pictures, that specialized in movie posters and advertisements. They developed and tested new applications for their fluorescent paints, including lithography, make-up, and fabric dyes.[2]

In 1938, Bob invented Zyglo and Magnaglo, two nondestructive testing processes that use fluorescent dyes to identify defects in machined parts. The dyes penetrate small defects and are seen when inspecting the parts under black light.[2]

During World War II, the company developed daylight fluorescent pigments, which are highly visible in daylight. Bob produced the first piece of high-visibility clothing by dying his wife's wedding dress.[2]

Personal life and legacy[edit]

Bob Switzer married his wife Patricia (a Berkeley native) in 1936. The couple had three children. Bob died in 1997 at his home in Shaker Heights, Ohio from complications from Parkinson's disease. He was 83 years old[4]

When Day-Glo Color Corp. was sold to Nalco in 1985, Bob and his wife used the proceeds to establish the Robert and Patricia Switzer Foundation to fund students working on applied environmental problem solving.[4]

In 2009, "The Day-Glo Brothers," a children's book about Bob and Joseph Switzer's invention of fluorescent materials, was published by author Chris Barton and illustrator Tony Persiani.[5]


  1. ^ "Encyclopedia of Cleveland History: SWITZER, ROBERT C.". Retrieved 2016-03-23. 
  2. ^ a b c d e Bing, Liesa (1991). The Story of Day-Glo. 
  3. ^ a b "DayGlo Fluorescent Pigments National Historic Chemical Landmark". American Chemical Society. Retrieved 2016-03-23. 
  4. ^ a b Johnston, David Cay (1997-08-29). "Robert Switzer, Co-Inventor Of Day-Glo Paint, Dies at 83". The New York Times. ISSN 0362-4331. Retrieved 2016-03-23. 
  5. ^ Cohen, Rich (2009-12-16). "Books About Inventors". The New York Times. ISSN 0362-4331. Retrieved 2016-03-23.