Thick black walnut ink

 

I just started using some of the black walnut ink I made last November.  I have four jars from that batch.  The first one I opened was oddly thick.  I could still use a paint brush with it, but it was too viscous to use with a dip pen.

The second jar I opened was normal, and worked wonderfully with a dip pen.

I wonder what happened with the first jar? (I haven't checked the other jars yet.)  It was pretty weird; not crusty at the top like it had dried out, just uniformly thickened.  That jar did have a small film of mold growing in it, but I've had mold in jars of ink before and not had it affect the ink flow.  I wonder if the gum Arabic I added did something strange?  But if so, why didn't it do that to the second jar?

I might be able to re-thin it with water, and even if I can't, it's not a great loss, and like I said, I can still use it with a brush.

I had the idea of obtaining a large number of small bottles and making ink to sell, but if I do that, I guess I better establish some quality controls!