Abstract
The red colorant in reduced copper glazes has been positively identified as metallic copper in colloidal form. The identification was made by forming a copper red in sodium metasilicate and dissolving the resultant glass in water, thus concentrating the coloring material until good X-ray diffraction patterns of metallic copper were obtained. It was found that excellent reds could be obtained by the usual alternating cycle of reduction and oxidation, by the addition of reducing agents to the glaze, or by a uniform, slightly reducing atmosphere. Copper nuclei were formed between 800° and 1250°C. These nuclei could be grown to colloidal size at about 650°C. Too great a growth gave muddy reds and then blacks.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
