The paper arrived from Lithuania in an un-opened package. The seller was kind enough to translate a little for me.
Photo-paper, unibrom especially glossy
made in 1959I presumed this to mean a Silver Bromide emulsion with a fairly high contrast assuming a numbering system similar to what we are used to in the West.
Armed with this I looked for a low contrast negative. After scanning, in Photoshop the negative looks like this.
I then ran a test strip. The test strip got me about 8 seconds at f8 on my enlarger. I then exposed the Soviet paper at 8 seconds and developed as below... 2 minute Ilford Universal PQ (1+9)
20 seconds stop
5 minute Ilford Rapid Fix (1+9)
30 minute wash
with the following result. Great news…