Io personalmente in generale preferisco:
The Pigment compendium : A Dictionary of historic pigments
Autori: EASTAUGH Nicholas, WALSH Valentine, SIDDALL Ruth, CHAPLIN Tracey
Editore: Elsevier Butterworth Heinemann
Data di edizione: 04-2004
che è un libro (disponibile anche in CD) che però costicchia... veramente veramente completo, riporta anche numerosi riferimenti bilbliografici per ogni singolo pigmento.
inoltre per il verde rame (comunemente chiamato verdigris) esiste anche un completo rewiew che anche se ha ormai 15 anni credo che sia ancora un punto di riferimento piuttosto autorevole:
H. Kuhn, "Verdigris and Copper Resinate", Artists Pigments, Volume 2, A. Roy (ed.), Oxford University Press: Oxford, 1993.
Se ti servono solo informazioni generiche puoi consultare molte banche dati disponibil on-line dove puoi trovare alcune informazioni.
ti riporto questa:
http://www.argosproject.org/arpi/DispLemma.asp?Lemma=Verdigris(a dire il vero un po' scarna)
puoi anche trovare informazioni generiche in questo testo in inglese di un università texana che mi sembra dare qualche ragguaglio in più:
tratto da
Common Medieval Pigments http://www.ischool.utexas.edu/~cochinea/pdfs/a-baker-04-pigments.pdfVerdigris
Cu(OH)2 · (CH3COO)2 · 5 H2O
Infamous for being destructively reactive, this popular pigment consisted of the basic
acetates of copper in which the amount of acetate determined the greenness of the product.
Verdigris was produced by the corrosion of strips of copper with vinegar fumes. After the pigment was scraped from the plate, it was mixed with wine and allowed to thicken. Salt green was made from smearing the copper with wine, honey or vinegar and calcined salt before corroding. If the copper was smeared with soap before being suspended it was known as “rouen” (Ross 19). Also known as Spanish green, the pigment is incompatible with white lead and orpiment as well as many media and surfaces. Verdigris is destructive and will degrade cellulosic materials and parchment. In some Persian miniature paintings the presence of saffron appears to mitigate the harmful effect of the verdigris. The major chemical mechanism responsible for this behavior is the saffron solution serving as a buffer. Research by Barkeshli shows results that verdigris mixed with saffron did not char the paper support, and charring
occurred only where the pure verdigris existed.
The color ranges from green, green-blue to blue and it exists in two types: basic and
neutral verdigris. The neutral form seems to be the preferred verdigris pigment in the Middle Ages. Basic verdigris is formed when acetic acid vapor, water vapor and air act upon copper and copper alloys. Neutral verdigris, or verde eterno, is neutral copper acetate formed when basic acetates are dissolved in acetic acid, as recommended by Cennini. The basic pigment is composed of blue-green crystals that dissolve entirely in water and decompose when boiled.
They dissolve in acetic acid, producing a dark green solution (Feller vol. 2).
Neutral verdigris particles are composed of tabular crystals with rhombic and hexagonal
faces, resembling large chunks. The basic blue particles resemble bundles of long, fine needles. Verdigris reacts destructively with its binding medium and binding surface. It is commonly known that the reflectance of verdigris pigment changes as it dries. Freshly applied verdigris differs from day old pigment and three month old pigment. Verdigris mixed with sulfur containing pigments in an aqueous media may darken due to the formation of copper sulfide. A test of verdigris pigment under three months of high illumination of fluorescent, xenon lamps and mercury vapor lamps showed no change, supporting the paints strong lightfastness, and also suggesting the brown discoloration that has been observed is not caused by light damage (Feller vol. 2)