That's funny, Miss Dale.  I worked at Aerojet-General Corp. doing research work on solid rocket propellants for the Polaris missile system.  I worked with many hazardous materials including explosives.  After about 5 years though, my liver function tests were showing the possibility of reaction to some of the chemicals.  I switched to doing metallurgical research at that time under the direction of Dr. Erwin Rudy, an Austrian physical chemist.  After 5 years with him, he accepted a professorship at the Oregon Graduate Institute and he asked me to move to Oregon with him to work and help get the laboratories set up.  A great deal of my work was doing photographic work in conjunction with publishing his scientific papers.  I had three darkrooms to use and I was the only one using them.  One room was dedicated to processing of films, both X-ray and photomicrograph films.  I was able to do some work in conventional photography also, but that was a small part of the job.  Another darkroom was for printing the pictures and it was well equipped with commercial grade equipment.  I have a contact printer here at the house that came from a similar lab that Dr. Rudy set up and that printer cost $1200 in 1968.  In the third darkroom, I had a process camera, a worktable for sample preparation, and two X-ray machines for doing X-ray diffraction photography on metal specimens.  I left that job in 1972 to start my own full-time business doing service work in heating and air conditioning.  How's that for a switch?  LOL