![]() ![]() On the front of the label it says, “Conforms to the pigment composition requirements of commercial standards CS 9842 of the National Bureau of Standards.” Some time ago, I noticed that on the back it says, “Composition Guaranteed,” “Genuine Ultramarine Blue Pigment,” and also, “Statement of contents as recommended by the American Artists Professional League.” It also mentions that it contains less than 2% aluminum stearate as a stabilizing agent. I have an ancient tube of Permanent Pigments Ultramarine – I know it’s at least 30 years old, and quite probably older than that. OK, this isn’t completely on topic, but I think it’s close enough, given some of the earlier discussion. It’s worth nothing that every paint they sell has an A rating except for Alizarin Crimson, which they continue to sell because a lot of people want to buy it and not because their chemists think it’s a good idea to use it.) For this purpose, it’s safe to use any paint that W&N gives an “A” rating to: (I link to W&N because they have a nicer online chart than any other manufacturer. It’s an interesting discussion, why not talk about it?įor the OP’s sake, and anyone else, ultramarine is perfectly safe to use if you just want your paintings to last during your lifetime, and the painting will be kept indoors. Why does every thread have to break down into these über technical “endurance of pigment X in condition Y versus condition Z” speculations? Can’t we ever just discuss how a certain oil paint look, feel and handles? And not debate whether a pigment with ASTM X will last 150 years or 250 years? Because I’m not sure that’s helping OP decide. It might be better to use Prussian blue instead? Aivazovsky used ultramarine during short period, but finally ceased it. before using ultramarine, I will think twice. ![]() ![]() It is photosensitive pigment which can cause discoloration of organic pigments in mixture. The so-called ‘ultramarine disease’ is said to be the result of decomposition of the varnish in oil paintings.” It may form a white coating/ blanching on its surface as a result of hydroscopic action. Discoloured by alum and vinegar, which were often used in tempera. The artificial ultramarine can degrade much faster, it is well known “Ultramarine Disease” effect.ĭegradation processes: becomes quickly discoloured by the action of weak acids, which attack it forming hydrogen sulphide. Natural ultramarine can fade quite slowly. Researchers Find Why Ultramarine Blue Fades: You should do frescos, they will easily outlast all your oil paintings. LFI, which ultramarine has, guarantees 125 years of lightfastness without any visible change under museum conditions.Īnd if the goal is to make your work last for centuries, why oil paint at all. But Ultramarine?Įarth will be taken over by aliens before your ultramarine fades. I get the worries about pigments like Alizarin Crimson. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |