Organic agriculture is an ecological production management system that promotes and enhances biodiversity, biological cycles and soil biological activity. It is based on minimal use of off-farm inputs and on management practices that restore, maintain and enhance ecological harmony.
Try using the milk chocolate melts with some black coloring for the black and some white chocolate melts with the yellow and black colorings for the gold (reminder: use the black VERY sparingly).
When chocolate turns gray like that, one of two things could be the culprit: sugar bloom or fat bloom. Sugar bloom is normally caused by surface moisture. The moisture causes the sugar in the chocolate to dissolve. Once the moisture evaporates, sugar crystals remain on the surface.