I love the look of Tri-X in D-76, but one of the things I don't like about it is having to create the liquid in high volumes: the 1 liter package is too small, but the 1 gallon package is too large given my shooting volumes.

Today it occurred to me that I could just make it and use it right away, i.e. not keep a working solution around. Has anyone else done this? Anchell and Troop list the recipe for it and its variants. I assume it's straightforward to do. Do the components (metol, hydroquinone, sodium sulphite and borax) keep effectively indefinitely in powdered form)?