Hi, I shot infrared film and like to use hard paper. Actually Ilford RC 24M semi-matt is actually what I need. Unfortunately I can not find it 20*24 in grade 4. The best I can find is 3 and it's rare. It would be proper to use variable contrast, but 24M got the best surface as it tastes to me. It does not shine when look from various angles. It is easy to retouch also. Can any one recommend a high contrast paper developer which will boost grade 3 to grade 4 or even further? Regards, Ibrahim Pamuk