To complicate matters, Ilford filters change color over time, and not in a uniform way (I have several sets of these filters acquired from different sources at different times ... no two sets are identical). It may therefore be necessary for you to determine what filter(s) produce(s) the best result taking the usual variables into account, e.g., the contrast of the negative you're printing, your light source, paper, chemistry, printing procedure, and, of course, your objective. You may find that you need to combine filters from 2 or more sets to arrive at a set that gives you satisfactory results, or resort to split-filter printing in some cases. The filter you identify as "i" is likely either a 00 filter (pale yellow) or safelight filter (red). The information at
https://www.ilfordphoto.com/wp/wp-co...Multigrade.pdf is dated but still useful.
N. Riley
http://normanrileyphotography.com
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