Someone else may have some suggestions, so I'll butt out after this, but a bottle of HC110 is pretty cheap. Someone can probably give you an old bottle that is laying around; I would if you were near here. An old bottle of dark brown HC110 will probably still work fine, and since you have to find your times anyway a slight loss of activity wouldn't make any difference.
Originally Posted by silvergrahm
Maybe you just enjoy experimenting, but I don't see trying to re-invent the wheel.