Good for you - there is a solution to the Buffalo - it's called Nic-A-Date, not sure if they still sell it.
sorry stick the buffalo in a jar cover with white vinegar check in a couple weeks date may appear I have 80% success really does work
Nic-A-Date is mainly ferric chloride, which is sometimes available in Radio Shack or other such that might offer printed circuit board stuff, as it etches the copper. Not nice stuff though. Google can give you home-made recipes Amazon has ferric chloride also.