Includes:

• Epoxy decapsulation
• Etch solutions (ex: HNA)

Above: WFNA fuming

I've had the best luck storing it in actinic (tinted) glass with a PTFE stopper. Although, I've only used the PTFE stoppers because it came with the bottles. PTFE has a high CTE and a glass stopper would probably work better.

Standard glass seems to work decently but I found that it decomposed quicker. If it was stored in a cabinet it should be fine.

Above: RFNA stored in a standard wheaton bottle. I had 70% stored in an identical bottler for over a year and had no problems. Unfortunately, RFNA is much more potent and the fumes ate through in a matter of days. Upon mild pressure the top collapsed altogether.

Distill it yourself

DudaDiesel sells this in 63% concentration but can sell you higher concentrations if you ask nicely / pay extra.

I do not know of any US suppliers that will sell RFNA to the average joe.