Had a conversation about rubber color yesterday, and it made me wonder: is there any demand for off-white, sort of a light cream color? I could see this being useful for older titles whose natural rubber was not a perfect white even from the factory. The modern benefits of silicone with the look of period-correct rubber supply.
I don't know if this has been brought up in the last 56 pages or not, but I thought I'd mention it just in case.