some of my favorite inks are iron gall. So I took some of these to see what happens when I mix them. :-)
ESSRI, blue-black IG
Gutenberg G10 Urkundentinte "Schwarz" black IG
Platinum Classic Forest Black, green IG
Platinum Classic Sepia Black, brown IG
1. I wanted to make Forest Black darker and less yellowish:
My favorite: 75% Forest / 25% ESSRI (darker but not a cold green)
2.: Forest Black mixed with G10:
Favorite: 67% Forest / 33% G10 (a "Moddergrün" = murky green, like Diamine Safari but darker)
3.: Forest Black with G10 and ESSRI:
Favorite: 40% Forest / 40% G10 / 20% ESSRI (subtle gray-green)
5.: Sepia Black and ESSRI:
Favorite: 50% Sepia Black / 50% ESSRI (nice dark gray-black)
Nib used: Swan B-stub; paper: Clairefontaine 90g/m3
Photos were taken 10 days after writing.
No mixture developed a sediment in these ten days.