I am slowly working on my antique replica here above into the GREYS these days along with the weather!
Try dyeing warm GREYS by adding some Seal BROWN or Reddish Brown . or some Mustard or Slate Blue instead of only BLACK to make a grey tone . . . .
You don't need to add much but- it certainly makes some beautiful and more interesting GREYS!
HAve fun and experiment in those pots today!