Message #16479

[rpfstoneman]

Giovanni,

Although it is true that you would expect with some pigments that the more dense, or concentrated, would result in a deeper, richer, color.  Apparently not the case with copper red as explained in the ‘link’ I provided in the initial post with this bottle. Here is a quote from the link;

“The trick is to stop after the first reaction. This can be partially achieved by adding extra ingredients to your glaze mixture, an art virtually lost after the Ming dynasty.  For example, in contrast to your expectations, an extremely low concentration of copper in the glaze (i.e. 0.2-0.5%) gives best results (the most bright red color).  Higher concentrations of copper will lead to the formation of Cu in the glaze (the 2nd reaction) and you get brown areas.” 

The provided link from the Gotheburg site gives some great insight as to the difficulty in the use of copper red and what is needed to achieve uniform coloration.   

Charll