Acid etching: You start by drawing on a Lino is a floor covering like you metal sheet and then strong Acidburns a groove in the metal. you put in probably walk on everyday, you some ink and then squeeze the metal can cut drawings into it, put somesheet and the paper together very very ink on it and press it onto paper to hard till your drawing appears! see your image. Magic!
A Collograph is kind of collage that you cover with varnish andthen put ink on.You can press hard against some paper and all the nice marks transfer to your page
Colours can be added after your hand sometimes makes its dry if you are using oil marks on the page where youinks this will not work if hold it against the ink, but ityou are using water based can make a really nice effect inks