[pure-silver] Anti-halation backing?

I'm assuming that I'm not alone in noticing that Agfa must be using a lot of dye (?) on the back of their 120 APX100?

I recently dusted off the Yashica Mat 124 and shot a dozen rolls of APX100. When I poured out the pre-soak water, it was a very deep blue-black color. The first time I saw this, I about had a heart-attack - I thought the emulsion was washing off the base!

The resulting negatives are very nice - very clean and sharp. (I used WD2D+)

I have not shot a lot of 120 lately - is this heavy dye thing mostly an Agfa characteristic, or common to 120 film? I don't recall getting this with 120 Tri-X.

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