The 1,2,3- and 1,2,6-isomers have been reported, but there is no spectroscopic evidence to support either structure. Oxadiazines ( Table 4) of all six types are reported, four of the isomers having an extensive and well established chemistry. All six of the possible dithiazines ( Table 3) are described in the literature although the rarer 1,3,2- and 1,5,2-isomers are only known as the fully oxidized tetraoxides. Of the six possible dioxazines ( Table 2) only the 1,2,3-isomer is unknown. Thus, for example, 1,2,5-oxathiazines are only known as the 2,2-dioxides. A general feature of this and other sulfur-containing systems is that they are often only known with the sulfur atom in its higher oxidation states. Of these, six of the possible oxathiazines ( Table 1 ) have been reported. Two thirds of the 34 possible systems containing at least one nitrogen atom and oxygen and/or sulfur are known and well described. 51300 (42) and Sirius Light Violet FRL, or Remastral Violet FrL, C.I. Other examples are Sirius Light Blue FF2GL, or Remastral Blue FF2GL, C.I. 51320 (94) is prepared by condensation of chloranil and 3-amino-N-ethyl carbazole followed bysulphonation. Sirius Light Blue FFRL, or Remastral Blue FFRRL, C.I. Unsulphonated compounds are important pigments.ĭioxazine dyes are prepared by the reaction of benzoquinone derivatives, in particular tetrachloro benzoquinone (chloranil) with aromatic amines in presence of an acid binding agent, followed by oxidative cyclisations. Among these, the dioxazine dyes have the greatest industrial importance. The bisazine dyes include the fluoridine dyes ( X = N ), the dioxazine dyes ( X = O) and the dithiazine dyes. The groups D 1 and D 2 are not really required and are lacking in a large number of important dyes. The chromophore can be visualised as 1,4-didonor-2,5-diacceptor substituted benzene. These dyes have the general formula 39 where D 1 and D 2 represent the donor groups.
Sekar, in Handbook of Textile and Industrial Dyeing, 2011 12.4 Bisazine dyes and copper phthalocyanine dyes It means that the way I make a pigment into a watercolor paint in one country can be totally unsatisfactory in another country.N. For example, the climate can be a variable that is difficult to control. It is difficult to guide a new paint maker here because of the many factors that can affect a paint's final curation. It takes much practice to learn each individual or family of pigments binder needs.
It is not easy to simply add binder to said matte pigment and get sound quality paint. Mica pigments, in comparison, are not as variable, cure well, and do not require mulling. If you have only worked with mica pigments, it will come as a shock at first to try out matte pigments. This is THE most challenging part of being a paint maker and working with matte pigments.
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I would recommend that you gain experience and some confidence with understanding how to adapt your own binder to pigment ratio.
I have referred to it in an earlier blog post regarding friendly and not so friendly pigments. I would not recommend it to a beginner paint maker. Honestly, it is a challenging pigment to work with. I first worked with Dioxazine Violet back in May 2019.
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