I just finished some tests with the pictures. On some out of the series not yet toned. I put a drop of sepia working solution and 1+9, as well as selenium working solution and 1+9. On the white of the prints in a dry state leaving them there for about 4 to 10 minutes.
Well with the selenium I can not really say anything happened. But the sepia did leave a stain the fresh 1+9 solution a lot.
They have not been washed afterwards(I do not know if this is important for this).
So it seems they were not washed properly.
Is this a reliable test?