A few more words on black walnut ink

I did some looking around, and it seems that many people who make their own ink have noticed two wonderful properties:

1.)  Excellent light-fastness (resistance to fading over time with exposure to light)
2.)  Increasingly waterproof over time.  This is great, because it allows for some tinkering before the ink completely sets permanently.

Most recipes also, it seems, include a dash of clove oil or whole cloves (to help improve the somewhat funky smell).  

Another:

30" x 22"
black walnut and gouache on 140 lb. Winsor & Newton Cold Press sheet