Hardwood floor stained from carpet padding

Moved into a 1955 house with carpet over hardwood. Pulled up some carpet tonight and discovered that the dark red foam in the carpet padding has stained our hardwood floors!
The stains are like spots of dried blood. Water doesn't soak them out. We're considering refinishing anyway, but does anyone know what causes this?
Could it have come from steam cleaning?
(You know how carpet padding is made of different-colored chunks of foam? Only one color, the dark red, bled onto the floor)
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bryanska wrote:

bryanska, I all likelyhood the stains are from pet urine and have probably permiated the wood. It probably would not be able to be sanded out.
cutter
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Before I concluded that, I'd like the OP to compare the placement of the stains with the red foam in the pad. I've no experience, but he has a theory and he should run with it. Maybe not every piece of foam will show red on the floor, but every red spot will be under and shaped like a piece of red foam. It might have taken a water spill or something, even a pet spill, to bring the red out.
OTOH, in the late 1950's several murders were covered up in just this way, by getting red carpet padding and carpeting the rooms where the crimes occurred. After one killer remorsefully committed suicide and left a note telling what he had done, several unrelated crimes covered up in the same way were solved.

OK, just kidding.
Remove NOPSAM to email me. Please let me know if you have posted also.
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