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Not sure if this is the correct stuff so I am hoping that Alfons Bytautas Printmaker researcher extraordinaire will swing by this blog and confirm that this is the stuff I need to use to make the mordant in question ?
I read about it recently , in an article by Alfons, in "Printmaking Today". The article also referenced the NDI in printmaking website. which is also an excellent resource on matters of this nature.
I will be following the formula as iterated by Alfons.
Of course I will be posting on here about etching copper in this mordant and hopefully this will enable me to be able to etch a plate in my own studio as and when I need to.