For this purpose, I manufacture my own cupric lactate. Addition of sodium hydroxide and formaldehyde initiates the plating. This process would produce random particles and pieces of floating copper in the bath and produce no useful result were it not that accelerated deposition occurs at specific sites if one prepares the those sites in advance. The top and bottom surfaces are smooth. Now immerse the quartz in a mildly acidified stannous chloride solution for a few minutes.
Tin manages to attach to the glass.
It strongly adheres exclusively at roughened locations, however. Now lightly rinse the piece and immerse in slightly acidified palladous chloride. Palladium either replaces or immersion plates the tin. Dip the piece in just mixed parts A and B of electroless copper. Palladium acts as a catalyst to the reaction.