Odd expired Azo effect

[GregW]

Today I made some prints with some Azo from the late 1930s. Developing it in Ansco 130 with TAF-1. I'm getting a negative image? In other words, it's functioning as a direct positive at this point? I'm curious what is happening to cause this? It's grade 3, has a yellow label, single weight…
Anyone else had expired paper do this?

 

[ctsundevil]

I have a box of Kodabrome that behaves the same way. I don't have any idea why it does that.

 

[GregW]

Have you tried your Kodabrome in a pinhole camera? or as a paper negative in some other camera?