This Tag can be found on monosteel, san mai ,multibar forgings , annealed or hardend to help you pick the right toolsteel for the job. This pure Nickel in combination with 02 toolsteel ,the 99.8% ni content will results in the highest brightness/ contrast , is not effected by tempering colors and wil hardly oxidise when forging it so beware of Mushrooming an Cold shuts