Nicholas:(posted 8264 days ago)I have used XTOL several times and it has kept very well. Use a dark bottle in a cool or cold place, or keep it in a flexible plastic bottle and freeze it and it will keep for months or years.
XTOL was developed partly to satisfy the demand for an environmentally friendly developer, as it uses essentially vitamin C as a devloping agent and other rather benign stuff. I once made a developer out of a Vit C tablet and a spoon of baking soda. it worked but not well.
The alkalai agent in XTOL is a bit iritating but otherwise it is non toxic.
Cheers