Use an edge quench or make/get a bigger quench tank.6" PVC pipe makes great etching tanks,and can work for a quench tank in a pinch.Keep the hot blade away from the sides.Look around for a day or two and I'm sure you will see quench tanks all over the place - 4" shell casings from the surplus store,6" pipe cutoffs from the junk yard, a turkey fryer tub,old 100 cup coffee pot,you get the idea.
Stacy