Ink question re: PMS extender tint base

A while back I acquired a large lot of offset ink from a shop going out of business. Mixed in with the ink was several unopened cans of “O/S PMS Extender Tintbase” - can anyone tell me what this was used for? Is it similar to a transparent white? Anybody in Boston want some? I have about a dozen cans.


image: Photo 24.jpg

Photo 24.jpg

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This was (is) used to change the color of paper mostly on narrow web presses. This is the base component and one would mix in a pms color. This was a popoular procedure in direct mail shops on didde presses in which they had warehouses of white rolls and a customer wanted yellow for example.

Hope this is helpful, -Clay