{"product_id":"vivianite-grey-blue-pigment","title":"Vivianite Grey Blue Pigment","description":"\u003cp\u003eDescription\u003cbr\u003eVivianite Grey Blue is a natural pigment of crystalline vivianite, a hydrated iron phosphate mineral (Fe₃(PO₄)₂·8H₂O). Vivianite crystallises nearly colorless and deepens as its iron oxidises in the air, settling into a muted grey blue with a green cast. It is semi-transparent and very soft, so it glazes well and gives a quiet, earthy color rather than the brilliance of a mineral blue.\u003c\/p\u003e\u003cp\u003eIn use, Vivianite Grey Blue gives sober, atmospheric blues for shadow, distance, stone, weathered wood and overcast sky, and it is a natural partner to the earths. It mixes with white for cool dove greys and with yellow ochre for soft greens, and it reads deeper and bluer in oil than in the water based mediums. The pigment is soft and sensitive to grinding, so mix it into the binder with a palette knife rather than mulling it.\u003c\/p\u003e\u003cp\u003eKeep it away from lime, strong acid and heat: lime darkens it, strong acids dissolve it, and temperatures much above 70 °C alter it, so it is not suitable for fresco, lime plaster or encaustic. Protect finished work from strong sun, and keep the dry pigment cool, dry and closed.\u003c\/p\u003e\u003cp\u003eHistory\u003cbr\u003eVivianite was named in 1817 by Abraham Gottlob Werner, after the Cornish mineralogist John Henry Vivian. It forms where iron and phosphate meet in wet, airless ground, in bog iron and clay deposits and on buried bone, shell and wood, and it was long known to miners and farmers as blue iron earth or blue ochre. Because it was cheap and locally available, it served as a workaday blue in European painting, and it has been identified in sixteenth to eighteenth century works, particularly in the Netherlands and the German lands, often in skies, drapery and underlayers where a costly blue would not be justified. Its slow oxidation, from colorless through blue and blue green toward the yellow brown of metavivianite, is why vivianite in old paintings can read greyer or greener than the painter intended, and it has made the pigment a recurring subject in conservation studies of discolored blues.\u003c\/p\u003e\u003cp\u003ePigment Information\u003cbr\u003ePigment Type: Natural (Inorganic) iron phosphate mineral\u003cbr\u003eSource: Natural crystalline vivianite (Fe₃(PO₄)₂·8H₂O), ground\u003cbr\u003eOrigin: Russia\u003cbr\u003eSuitable Mediums: Oil, Egg Tempera, Watercolor, Gouache, Acrylic\u003cbr\u003eLightfastness: Fair to Good (Blue Wool 5.5 to 7.5)\u003cbr\u003eOpacity: Semi-transparent, glazing\u003cbr\u003eOther Names: Blue Iron Earth, Blue Ochre, Iron Phosphate Blue, Mullicite\u003cbr\u003eColor Index Code: N\/A\u003c\/p\u003e\u003cp\u003eImage: 'The Large Dort' by Aelbert Cuyp from the National Gallery, London\u003c\/p\u003e\u003cp\u003eHealth and Safety\u003cbr\u003eFor art use only. Not for cosmetic, food or children's use.\u003cbr\u003eKeep out of reach of children and pets. Do not eat, drink or smoke while working.\u003cbr\u003eAvoid creating or breathing dust. Work in a ventilated area and wear a NIOSH approved dust respirator (P100 or better) when handling dry pigment.\u003cbr\u003eWear gloves and eye protection. Wash hands and work surfaces after use, and never rinse pigment into drains.\u003cbr\u003eDo not spray apply, sand or burn.\u003cbr\u003eIf swallowed or if you feel unwell, contact a poison control center (U.S. 1-800-222-1222) or a doctor.\u003cbr\u003eSafety Data Sheet available on request.\u003c\/p\u003e","brand":"Morrow Archival","offers":[{"title":"2 Grams","offer_id":49396439220446,"sku":"PM-270-0000-0002g","price":16.0,"currency_code":"USD","in_stock":false},{"title":"10 Grams","offer_id":49396439253214,"sku":"PM-270-0000-0010g","price":44.0,"currency_code":"USD","in_stock":false},{"title":"20 Grams","offer_id":49396439285982,"sku":"PM-270-0000-0020g","price":80.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0739\/2821\/2702\/files\/pig__vivianite_grey_blue.jpg?v=1794344856","url":"https:\/\/morrowarchival.com\/products\/vivianite-grey-blue-pigment","provider":"Morrow Archival","version":"1.0","type":"link"}