End of run. The final bit of anti-halation black made for making panchromatic matrix emulsion. This washes out with a pre-soak as part of the processing of the matrix film; goes back to the 1950s method . After processing thru wash-off, the gelatin relief is clear, no black. This permits dye preview as in the “slip sheet” manner from the 50s. During transition of technology times, a manufacturer does not know which way the market will glide. Should we stay true, compatible with existing methods, or do we change product with expectation that the labs/market will adapt. Can we manage that risk: meaning absorb the cost and correct directions.
The initial Kodak relief, imbibition films, were clear-ish after wash-off. Previewing the color through a process of dyeing the mat, laying them atop the final support covered by a clear overlay (that 25th sheet) had become routine way of printing. A new matrix film should support that standardized lab method. Initially, PM did. But then, it didn’t. At first, PM relied upon a different tanning developer, and required a pre-wash to remove the acutance-black (sharpens by controlling “internal flare”). It was slightly blue, as was Defender-DuPont’s pan-chroma product. PM quickly moved away from the dye to a “pigment” dispersion throughout the coating. It didn’t wash out. Kodak also switched to a single tanning formula, dropping the specialized three part pan matrix developer. Soon after, PM got a number.
A long time ago doesn’t mean Y2K to me. 1950 is my long time ago.


Frank, November 2000:


During my initial years of making separations, I used Super-XX since a contact at Kodak’s Visual Research Studio suggested my PM exposures would be comparable. They were, within a step test.

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