Last night was my first night in a darkroom for 13 years. Just proofed some negs and did a couple of enlargements onto RC, just getting back into the saddle really. For the first time I purchased a set of Ilford MC filters to use for burning in shadow areas. One print, of a forest on a foggy day, still didn't have enough contrast with 170M (the max filtration on my enlarger) So I printed through MC filters as an experiment and found that 170M on the LPL matched the grade 4 filter. I was surprised with this as I always thought colour heads went a bit higher in contrast than this.