The same stock solution has been effective until now. Prior to these last two negatives, this particular batch of PYROCAT HD has sucessfully developed 16 8x10 negatives. I can clearly remember mixing the right mixture of stock to working solution. As regards darkslide not being pulled, cannot remember either way. If so, it will be a HUGE first! I use BTZS tubes hence developer is always first as that goes into the cap (fixer is in a tray). Unexposed must be right as any extraneous light should make it black.