Who knows what ink Press-A-Print uses?

I know what ink Printa uses. They will disclose that if asked. But I wonder if anyone knows what ink manufacture Press-A-Print uses. I know lots of companies sell pad ink - that is not of interest. I am actually trying to get the info on which company manufactures the ink for Press-A-Print OR ... if someone has a cross ref chart from Press-A-Print ink to another manufacture.

Thanks

Eric