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Instant Old Age To the Editor: I've been engaged lately in extensive English Tudor exteriors, involving much copper trim and finish, gutters, conductors, valleys scuppers, etc. Can you recommend someone who makes an application to accelerate the 20-year patina aging process? I've been told there is a chemical, which when brushed or sprayed, will produce that even patina finish in 2 to 3 weeks. Joseph McGrath Holliston, Mass. According to Paul Anderson at the Copper Development Association, the natural patina process in copper takes from 7 to 15 years depending largely on the type and level of impurities in the air. There are three different chemical treatments that will accelerate the patina process. Each treatment gives a somewhat different hue, and none is recommended