"IMPORTANT! This is a simple and fun technique which can be adapted to many ages. Make sure only to let young children blow the bubbles with a straw if you are certain that they are blowing and not sucking! If you are not quite sure, then let them dip the mug into the bubbles whilst you blow the bubbles. It may be necessary to put more paint in the water if the colour is too weak. You may use containers with lids, enabling you to save the water and stir it again when you next need it, if this activity continues over several days.
If you wish to saturate the rough surface further, then apply a coat of varnish. A matt varnish will, however, remove the beautiful glitter effect provide by the gold paint. A transparent varnish will partly preserve this, but you will achieve the best result by omitting the varnish.
This technique is only suitable for ceramics with a rough surface as the bubbles will simply slide off a glazed surface."