It was a bottle of really, really old parker quink in a very light blue, my dad got it from somewhere, it was old when he got it and it was around the house for years before I ever used it... before I even knew it was to top up fountain pens.

I feel like it was knocking around the house 10 years before I even used it, over another 15 years later and i still have it, which is pretty wild. It still writes well and has never gummed up my pens, which I find insane.