Their site says this: "Tire Life Latex Emulsion All gone, use ORANGE SEAL latex." As it happens, there was some Orange Seal in the pile of stuff where I got these tires, so I wonder if maybe that already been done a time or two.

I thought the consensus might be that these tires are unsuitable for riding. It would still be nice to clean them up and having them looking decent for display. I feel like these tires are as much a part of cycling history as most of the bikes I own.