Fig. 3: The calcination process of ‘Shengfanhong’ and related test results. | npj Heritage Science

Fig. 3: The calcination process of ‘Shengfanhong’ and related test results.

From: Research on traditional craftsmanship of ‘Shengfanhong’

Fig. 3: The calcination process of ‘Shengfanhong’ and related test results.

Color changes observed during the experimental process in traditional craftsmanship: a FeSO4·7H2O at the initial heating stage; b FeSO4·7H2O heated to the blackened state; c transition to reddish-orange after cooling. d Images of calcined ‘Shengfanhong’ powder at different temperatures in modern craftsmanship. e XRD of calcined FeSO4·7H2O at different temperatures. f XPS of calcined FeSO4·7H2O at different temperatures

Back to article page