Transparent Iron Blue

Trade names include Manox Iron Blue (Manox, UK), and Vossen-Blue 2000 (De-gussa, Germany). Transparent iron blue pigments are also produced by Dainichi-seika (Japan). 

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Two blue pigments can be prepared in transparent form cyanide iron blue and cobalt aluminum blue. These pigments are used in achieving a blue shade of the metal effect pigments in metallic paints. Transparent cyanide iron blue is prepared by a precipitation reaction similar to the one used for the preparation of the opaque pigment, but considerably lower concentrations of solutions are used. It is produced by Degussa (Germany), Manox (U.K), and Dainichiseika (Japan). 

Another very important application is the dispersion of pigments that are difficult to disperse (e.g., carbon black, transparent iron oxides, phthalocyanine blue and green, and perylene red). The use of CAB and two-roll milling is the most efficient method of dispersion. 

The transparent colorants which were used were a yellow (Fc203), red (Carmine), blue (iron blue) and green (Cr203). Other colorants such as phthalocyanine blue, phthalocyanine green, quinacridone red can be substituted for these pigments and actually such pigments are available. 

Use Level 3.5% (phthalo blue), 5% (transparent iron oxide), 1.5-2% (iron oxides), 02-0.6% (titanium dioxides), 7-35% (carbon bik.), 0.1-0.3% (lint base) K-Speise 152 [King Ind.]... 

Figure 1 Spectra of iron hexacyanoferrate films on ITO-coated glass at various potentials [(i) +0.50 (PB, blue), (ii) —0.20 (PW, transparent), (iii) +0.80 (PG, green), (iv) +0.85 (PG, green), (v) +0.90 (PG, green), and (vi) +1.20V (PX, yellow) (potentials vs. SCE)] with 0.2 mol dm-3 KC1 + 0.01 mol dm-3 HC1 as supporting electrolyte (reproduced by permission of the Royal Society of Chemistry from J. Chem. Soc., Dalton Trans.

P.R.171 is used in plastics and in paints. Its lightfastness in PVC equals step 7 to step 8 on the Blue Scale, depending on the exact composition of the tested system, the pigment concentration, and the Ti02 content. Incorporated in plasticized PVC, P.O.171 is migration resistant and heat stable up to 180°C. It is used in conjunction with organic yellow pigments, frequently also with iron oxides, to produce shades of brown. Shades of bordeaux are accessible in deep transparent colorations. 

Figure 8.3 Illustration of in situ spectroelectrochemistry, showing a set of UV-vis ( electronic ) spectra of solid-state Prussian Blue (iron(ii,iii) hexacyanoferrate(ii)) adhered to an ITO-coated optically transparent electrode. The spectra are shown as a function of applied potential (i) —0.2 (ii) -1-0.5 (iii) -1-0.8 (iv) -1-0.85 (v) -1-0.9 (vi) +1.2 V (all vs. SCE). From Mortimer, R. J. and Rosseinsky, D. R., J. Chem. Soc., Dalton Trans., 2059-2061 (1984). Reproduced by permission of The Royal Society of Chemistry.

Codein is a very powerful base it turns red litmus paper blue, and precipitates the oxides of lead, iron, cobalt, and nickel from their solutions. It is precipi. tated from the solutions of its salts by potassa and by ammonia in the latter case, however, It does not fall immediately, but is slowly deposited as small transparent crystals. ... 

Chalcanthon (Latin chalccmthum) is evidently used by Dioscorides to designate the sulphate of copper (blue vitriol), and also to include mixtures of sulphates of copper and iron, or even the sulphate of iron itself (green vitriol). The best, he says, is blue and transparent, and obtained by evaporation to blue crystals, but also it is obtained as... 

Aquamarine, like emerald, is a transparent variety of beryl, or beryllium silicate. Its light blue to blue-green color results from small amounts of iron in the crystal. Like most beryl stones, it measures 7.5 to 8 on the Mohs hardness scale. Most aquamarine gemstones come from Brazil. 

Phosphoric acid Nickel oxides and cobalt oxides An ingredient of white opal glass or promotes transparency to u.v. or opacity to i.r. when used with ferrous iron Brown, purple, deep blue... 

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