Subject:Re: Rose Medallion dishes
Posted By: Bill H Sat, Apr 06, 2019
During the time frame cited, a goodly amount of ersatz rose medallion made and sold on the planet was transfer-decorated ware produced by ornamentation factories in Hong Kong and Macao. By the early 1970s, some factories in Hong Kong had begun adding warning labels regarding lead content in the glaze, although I believe in the absence of information to the contrary, it is prudent to assume that such transfer-decorated dishes made earlier also had some lead content.
If I understand the problem correctly, Chinese historical ceramic wares always contained varying amounts of lead and other potentially harmful substances in their glazes and decorative pigments. However, it was less of a danger to those using highly vitrified porcelain dishes than pottery, which was fired at lower temperatures, thus was more prone to leach harmful substances into cooking oils and liquids.
Transfer wares made in Hong Kong and Macao before warning labels were introduced often began as Chinese or Japanese porcelain blanks, which posed no lead problems per se; however, the decorative enamels and glazes added by the ornamentation factories proved problematic.
So if you're certain about when your dishes were made, please proceed on the "better safe than sorry" premise.