Maxim Muir's Blue Black Developer isn't to dissimilar to ID62/D72 when you look closely. Divide his quantities by 3.6 and you get:

Phenidone. . . . . . . . . . . . . . . . . 0.61 g
Sodium Sulphite (anh) . . . . . . . . 50 g
Hydroquinone . . . . . . . . . . . . . . 14.75 g
Sodium Hydroxide. . . . . . . . . . . . 9.72 g
Benzotriazole . . . . . . . . . . . . . . 0.42 g (42ml 1%)
Water to, . . . . . . . . . . . . . . . . 1 litre

Commercial liquid developers (Agfa & Ilford) usually substitute Sodium Carbonate with Potassium or Sodium Hydroxide and Potassium Carbonate the balance of Hydroxide/Carbonate varies, but when the Hydroxide is too high the keeping properties suffer. Maxim Muir suggest a shelf life of a month and a short tray life for his developer. The level of Hydroxide is

Image colour/tone is related to grain size, it would be interesting to see what effect dropping the Sulphite level might have in a formula like ID-62 along with the increase in Benzotriazole. In addition switching from Phenidone to Metol which is colder working.

Ian