Also: do you have a reference for this concoction, or is it your very own idea?

m

On Wed, Jun 8, 2011 at 4:07 PM, Kevin Nichols
 wrote:
> 50:25:37.5 mmol/L HF/NH4F/HNO3 at 25C gives a smooth ~13 nm / minute
> in the borosilicate I use.