There are 2 kinds of petri dishes one invented in 1877 a solid gel of short shelf life needing refrigeration. A slant/liquid and solid culture media with petri dish was invented in the mid 1970's. The Florida Institute of Mold methods call for the petri dish invented in the mid 1970's. Mold inspections and mold testing using Modern mold test kits and methods.

Julius Richard Petri (1852-1921) is credited with inventing the petri dish in 1877. Mr. Petri who was growing bacteria in slant cultures needed sub-culturing on a solid surface to stabilize and segregate bacteria slant cultures. Slant or liquid culture is the first step in the recovery of microorganisms. Subculture from Slant or liquid culture to solid culture is the stabilizing and segregating step necessary to subculture for identification.

1970's Dr. Jonathan N. Roth invented Easygel ® which is a slant/liquid and solid culture media meeting the requirements for optimum recovery and segregation of microorganisms for identification.

 

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