Renewing Burrs

If you´re sick of throwing your worn burrs away, try this: First, clean your worn burrs thoroughly.I use a 20% sodium hydroxide solution warmed on a hot plate followed by steam cleaning. Dip the cleaned burrs in concentrated nitric acid and let the acid work for a half minute or less, then steam clean again. Your burrs should be sharpened. Nitric acid doesn´t work on high speed steel and some other metals. The burrs will be slightly smaller each time you repeat the process. The results are just short of miraculous.