Welcome to the eFile Express Minnesota Property Tax Refund Calculator! By answering a few brief questions, you can quickly see if you qualify for Minnesota's 2014 (or 2013) property tax refund -- and the amount of the refund if you do qualify.
Such etching is generally performed by immersion in a Nital solution containing nitric acid in a carrier solvent of alcohol with the acid concentration ranging from 1% up to about 10%. The active ingredient in Nital formulations, as the name implies, is nitric acid.
The nital acid etchants work by forming a colored surface film on the steel and attacking its surface to form pits. The etched surface is then microscopically examined to detect detrimental microstructural modifications (e.g. untempered martensite) that may have resulted.