OOPS! I did my first pre-flashing with VC paper and it worked. Many thanks to Les for sharing his knowledge with me. I guess I didn't pick up on using the technique with only graded paper.
Originally Posted by glbeas
I can attest to the fact that the filter grade makes no difference. I tried it it with 0, 2, 4, 5, and no filter. Tried split filtering on the same print with pre-flashing but saw no improvement.
Here's the one I tried all this with. In the final outcome, I pre-flashed for a couple seconds then exposed with a #1 filter.