Hello. I've never dyed silk before so I need some advice please. I have this dress which is lovely but for the red bit. I was thinking of trying to dye the whole thing a slightly darker blue, navy basically. There's no red thread to stand out and the lining is solid blue. Would it dye a uniform colour or would I end up with a purple bit instead of red, and is there anything else obvious that could go wrong? Not sure which type of dye to use - I'm used to the "bung it in the machine" all in ones and think this might be more complicated...?