coullone wrote:
I use the Kodak 18% grey card, they are made from an acid free material and will not change colour over time. They should still be stored in their original packing as any dye or pigment will fade over time - just look at Egyptian pantings in the Vally of the Kings!
Several people have mentioned the Kodak 18% gray cards and I had several years ago but have no idea what happened I will check into them and see about getting one of them (or several). I actually didn't look for them because I thought Kodak went went out of business and figured they probably weren't being made any longer. There is a good chance they would be exactly what I was wanting. Thanks.