I'd make a solution of zinc nitrate and add a drop or two of manganese nitrate (or make it in situ by a suitable reduction of potassium permanganate) per mol of zinc. (Without specific data on the amount of manganese required you might have to experiment a bit to optimise things. There must be some old publication somewhere with a paper on this exact matter.) Then you just drop in sodium silicate solution according to the appropriate stoichiometry, allow to settle overnight, filter, wash, and dry in the oven. A small amount should go quite a long way.
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli