This is box #6, this one was free. It's perfect as usual. Nothing better for Tangiers Lucid, Fumari, and Nakhla.
Ohh, yeah, coal is a natural humidity regulator and will release/absorb humidity in relation to the relative humidity of your environment. I am pretty positive that heating them up when they are overly dry or overly wet would cause problems, but this is an extreme. Funny how all these problems with CH coals happen when the weather starts to change, eh?