Another alternative to Ansco 130 is PPPD - it's a Pyro developer for paper.
750 ml water
30 grams sodium sulfite
.34 grams of phenidone A in 20 ml of 91 % alcohol heated to appr 125 degrees to dissolve
10 grams catechol
10 grams pyrogallol
40 grams of sodium carbonate
3 1/2 grams of potassium bromide
5 grams of citric acid
water to make 1 liter
(add chemicals in order specified and make sure that each is fully dissolved before adding the subsequent chemical.)
over two hours and it was still active (emergence times still at 25 seconds after two hours) and it did not stain the paper. Still delivers a good dmax. Increasing the pyrogallol sets the blacks better.
This should give improved performance over the MAS Amidol for enlarging paper at a sizeable savings.