Also recognized as Monoazo, Hansa Yellow, Brilliant Yellow; it has gained wide recognition and reputation among the artistic colors. It is widely preferred in the printing industry. It is available in wide variety of choices, but just be ensure that one opts that one labeled ‘LF’ (which means, light fast). Regardless of this optimistic title, even the LF version fades in tints, however, in mass-stone, it is rated among the best.
The diazo and monoazo pigments are omnipresent in almost all the art materials and in almost every industry. Those were the primary modern organic pigments which were commenced under the name, ‘Hansa Yellow’ in the in the early period of 20th century as ‘enduring’ substitutes for several transparent lakes and gums which heads before them. Several fabricators used to adore their shading strength and vivid and dazzling colors, however, their sensitivity for lighting soon become obvious and they would forever be poor cousins to the appreciated Cadmium’s. Companies like printing were not much alarmed about these constraints since they were inexpensive and suitable for short term use flawlessly.
They have commendably improved over the years, the most primitive version of it was ASTM l l, the newer version is known as ASTM l. It must be comprehended that that ASTM l stands for a wide variety of light fastness and most of those Arylide Yellow 74 Opaque pigments are at bare minimum which could be acknowledged as the most permanent class. Most of these could fade in tints with white. Most of these are regarded as non toxic, and these non toxic are average drying and make hard and moderately supple oil paint films. These could also be arranged under the ASTM classes. All these are generally offered for artist’s uses which are generally known as arylide or azo. And there are also others, which have other general names and artists do not recognize that they are still part of that group.
Referring to the color index name is utmost essential. One must also consider that disparity of light fastness in an ASTM classes are marked by a particular terms as poor, good, very good, excellent. The last two are never used inside ASTM l; in other words, well generally refer to the poorest performing pigments in the class. Pigments like diazo, Diarylide Yellow 83 and monoazo must be avoided as being inadequately light fast. However, there are various artists who find their clean color united with affordability in comparison to various substitutes to be irresistible.
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