There is a recipe for PC-TEA print developer in the formula section. I am using that now for anything but AZO. It is almost safe enough to drink and eventually you start to wonder what all that skin exposure is doing to you. It is also pretty cost effective - the main component is a mixture of TEA Phenidone (very little) and citric acid - It keeps very well - It is mixed with water and sulfite and some other powders to make the working solution. It keeps about a month in an airtight bottle and a liter is good for about 40 8x10 sheets. It is an experience to make - using the kitchen stove and all but it works great, lasts long, gives great blacks and is cheap.