Copper salts include copper hydroxide and copper carbonate and may
be found in ceramic supply stores.as finely ground pigment…for use
in making ceramic glazes. If you cannot find these, you can actually
grind up malachite into a fine powder. A solution of copper sulfate
will also work…the important element is copper in some form.
For an organic glue, you can use fish glue, hide glue, agar agar,
gum tragacanth…the legendary Elisabeth Treskow of Germany used
saliva…I guess it provided just enough organic material and had a
glue-like consistency. The secret is in not only in the combination
of ingredients, it is in the control of heating the piece to be
granulated. Experiment and you will discover.