In SX Microcontrollers, SX/B Compiler and SX-Key Tool, prcoy wrote:

Remember a penny really isnt copper anymore..mostly zinc I believe. U might want to check the thermal properties of zinc. 

from lrs.ed.uiuc.edu
1947-1962 3.11 g 19 mm 95.0% Copper and 5.0% Zinc & Tin (bronze mix) 
1963-1982 3.11 g 19 mm 95.0% Cu and 5.0% Zinc 
1983-2002 2.50 g 19 mm 97.5% Zinc and 2.5% Copper (20% lighter)

I'm with Guenther find a small copper sheet..fold it to have fins: MMMM

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