Greetings and Salutations!
Well, after a lonnnngg break from ink mixing and fountain pen faffing I've finally returned and had some fun. I decided that I wanted to make my own ink. Not mix, but MAKE. First off, I have to give all the credit to Pharmacist since this ink is based on his recipe. I did deviate on some of the steps but I will explain that below. The biggest hurdle was to get hold of Gallic Acid. I searched high and low and could not find ANY in South Africa, but finally managed to get some imported by a chemical company. The rest of the chemicals are quite easily obtained here. So without dragging this out, here's the recipe:
5ml glycerine (I did not add this, as I will explain after)
1gm Gallic Acid
1.5 gm ferrous sulphate (hydrated?) (FE2SO4.7H2O)
200 mg salicyclic acid (preservative to prevent mould)
1ml hydrochloric acid 25%
1. Dissolve gallic & salicylic acid in 40ml hot distilled water
2. Dissolve ferrous sulphate in 40ml hot distilled water
3. Add hydrochloric acid to (2)
4. Add (3) to (1)
5. Add 10ml Pelikan 4001 Royal Blue to (4) - did not add
6. Add glycerine to (5) - did not add
Okay, the recipe is easy and straight forward. I did not perform step 5 & 6, so I ended up with a base iron mix that is pale lavender in colour. On paper it is basically invisible for the first 10 seconds after which it starts turning black. The reason I did not do the last two steps is to be able to experiment with different colours etc.
I took 3ml of the base, added .5ml glycerine and .5ml Waterman Purple. The result is a light purple ink that darkens to something I would swear is the exact same ink as R&K Scabiosa. I've tried the ink in a cheap eye dropper with a bit of a scratchy nib (yeah yeah, Im too lazy to smooth it), but the ink flows nicely. Shading is very good and since it Is and IG, it is waterproof in the sense that only the added dye/ink will wash away, leaving the black IG component on the paper. The test was done on Tamoe River (cream).
I do not have proper tools to measure the acidity of the base or final ink but after a week in the cheapy pen (no precipitation or gunking) I can't see any adverse effects yet. I'm linking the smaller version of the scan and including a link to the full sized version.
Link to full size scan: