Original A212CW AC Air Filters

[67L78conv]

So since everyone is on the subject, exactly which one would be considered correct for a 67 L78 Camaro form a judging point of view?

[Tommy_Mathison]

I have a question for those who have been around longer than I have. Was the oil-saturated filter paper in these elements yellow when they were new or is the yellowing something that comes with age?

[Mr70]

They were slightly yellow when brand new,do to the oil wetted paper and as time wore on they became even yellower, even if never used at all.

[firstgenaddict]

Filter paper is impregnated with formaldehyde and other chemicals which is probably what causes the yellowing, although papers manufactured before the last 15 years used a much more caustic/acidic process to bleach the fiber, which causes yellowing and deterioration. (think old newspapers)
I had 200 tons of waste filter paper bales from a DANA/WIX plant, it would give you a headache just being around it for 30 min. It was almost impossible to get rid of, I sent a load to China, they said NO MORE, I ended up selling it to a company that manufactures roofing felt.