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  • Steel Etching and Marking from a DC Adapter

    I made it too, thanxx to your instructables, but the blackening appears to be dark greyish.i used 9v 2amp.Tea mark in10 sec and coffee in 5 sec, n coffee i got ome patches Please suggest how to achieve perfect ink black mark and minimise duration.any change in electrolyte or technique?sendin you the snap.Thanks again

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