I have been recommended a product called Blacken-it, and am trying to track down a supplier/seller in the UK and/or EU.
From what I can gather it could be something from the USA, as it was recommended from a forum, and everyone was talking about 'railroads' rather than railways.
Does 'Blacken It' ring any bells with anyone, as I have been unable to find it on any UK websites so far. Or can anyone suggest any alternatives?