On 12/20/2005 at 12:29 AM ard at p850ug1.demon.co.uk wrote: >Then why are many opto-isolators in white DIL pacakges, resistor networks >in blue or brown plastic DIL packages, etc? I can't imagine the packaging for ICs being made from recycled anything--I'd think that there would be too many unpredictable impurities. Cheers, Chuck