D´OH.
Few weeks ago I made some walnut confect and got liiiiitres of that brew.
For clarification, let me point out the recipe, a russian/armenian one - you take green, young, soft walnuts and pick them with a needle. Soak them in Water for two weeks and change the water on a daily base (it gets brown and soaked with tannins). Then you make a syrup of water, sugar, spices, boil it and pour it over the walnuts. Put them in glasses, seal them, leave them for 6months, a year, whatever.
Tastes great, you eat them with the thin, young shells and you can use the syrup to sweeten your tea... I learned it last year in Armenia.. yum. Can´t wait to break the first seal. .-)
Well, I guess that water would have made a good opportunity to test it. But it´s too late... the water stains pretty much, it even stained a ceramic plate I put in the tray to push the nuts beyond the surface.