I have just bought a bottle of this developer and additive and did some tests on Ilford Multigrade IV RC. I must say that the effect was somewhat less than I expected. I use it diluted 1:9 without the finisher blue additive or add 5ml of the additive. Its possible that Multigrade is not that receptive to this developer. I would welcome any insights or advice form anyone using this developer. It did not come with any literature. Thank you.