Whilst I was suffering from Flu last weekend I decided to use the time to sort through all my old Citadel paints and transfer them to dropper bottles. Most of the opened ones were sadly unusable so ended up in the bin. Luckily, I bought quite a few of the old box sets when the paints were changed over to the hexagonal pots in the 90's. All of these paints were still in perfect condition and easily poured into the dropper bottles without any sign of lumps or residue, and GW claim the new paints are an improvement.
I'm looking forward to using these on some old figures over the next few months.