The phenomenon has been observed in several experiments, including experiment E791 at Fermilab. The experiment ran from June 1988 to January 1992 and collided high-energy (500 GeV) pions onto carbon and platinum nuclei. The experiment observed evidence of color transparency in the production of vector mesons, such as ρ ρ and ϕ ϕ mesons. Other experiments that observed evidence for color transparency include the E665 experiment, also at Fermilab, the HERMES experiment at DESY, and the E02-110 experiment at Jefferson Lab.