What does glycin add to a developer?

DREW WILEY said:

Oh yeah, Sorry. Slip of my mind. I printed some of that same Foma last year. It was the LEAST responsive to developer and toner controls of any paper I recall using, except MGIV. Otherwise a high quality paper, but not one I'll likely use again due to its toning and hue inflexibility. I guess I was subconsciously contrasting it with Bergger neutral tone, which is highly flexible in terms of image tone.

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