
 Originally Posted by 
brandon
					 
				 
				^^^ thats copper
			
		 
	 
 Its 'tinned' brass, I think.   I do see yellow brass heatsinks occasionally, mostly over electric motor driver chips.
Those heatsinks above ^ often have a couple of iron wires pressed into them to solder them to the board.
 The motor driver chip brass heatsinks are normally soldered to the board & come from 70's Tv's. They may also protect everything else on the board from the EMF (electromagnetic field/force) the chips may make as they cover the whole chip.
A interesting distraction when scrapping.
 
						
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