Digital BW, The Print

>... Is it the right version of Tergitol though?

Tergitol 15-S-7 is what I found worked.  See http://www.dow.com/surfactants/products/second.htm for the listing of the Tergitol family of surfactants.

(Some internet sources suggested the S-5 variation; it was terrible.)

> Have you tried/considered to get the Edwal LFN ...

Edwal Scientific is in Chicago and might be able to point to other sources.

Be sure to use Photo Flo 200, not 600.  The 600 has a higher concentration of surfactant per volume and a rather toxic form of glycol.  The mix needs the amount of glycol in the PF 200.  So, you'd end up having to use more of the 600 to get that.

Paul
www.PaulRoark.com