Foma Fomatol LQN is a highly-durable, liquid concentrate black and white paper developer (phenidone) for both manual tray and machine processing. Manual processing dilution is 1:7, while machine processing dilution is 1:4. 1 liter of ready-to-use solution (dilution 1:7) is enough to develop 30 sheets size 20.3 × 25.4 cm of photo paper on baryta and 58 sheets size 20.3 × 25.4 cm of photo paper on resin-coated paper base (RC).

Fomatol LQN produces a slightly warmer image tone and is similar to the Kodak Polymax T Paper Developer. LQN works best with Fomaspeed RC and Fomabrom FB photographic papers.