This slate is a thin, dark, blue and black, 5/7mm slate from the CCG quarry in Ankang, Shaanxi Province, China. The slate is slightly textured and virtually free of pyrites. The slate is fully tested in the UK and is A1, T1, S1.
It is vitally important when choosing Chinese slates that the correct criteria is chosen, many Chinese slates do not meet the S1 standard, as such they are prone to weathering and fading, in some cases quite dramatically over a period of a few weeks or months, creating a patchy range of colour from dull white to dark grey.
Huan Yu blue slate is covered by a 60 year quarry non-fading guarantee.