Glass plates, colored

Dyes for Color Filters. Colorhquid crystal display systems consist of LSI drivers, glass plates, polarizers, electrodes (indium—tin oxide), and microcolor filters. The iadependent microcolor filter containing dyes is placed on each Hquid crystal pixel addressed electrically and acts as an iadividual light switch. All colors can be expressed by the light transmitted through each filter layer of the three primary colors, ie, red, green, and blue (Fig. 12). 

Fig. 12. General stmcture of LCD. A, polarizer plate B, glass plate C, electrodes (indium—tin oxide) D, Hquid crystal E, common electrode (ITO) F, overcoated layer G, colored pixel H, back light. In an improved color LCD system today, retardation films are placed between A and B.

Organic acids yield lemon-yellow zones on a blue background [1]. Halide ions migrate as ammonium salts in ammoniacal mobile phases and are also colored yellow. The colors fade rapidly in the air. This can be delayed for some days by covering the chromatogram with a glass plate. 

These chromatograms acquired a dark brown coloration within seconds if they were heated or exposed to UV light the same effect was observed on covering the chromatogram with a glass plate ... 

The blue derivatives formed with the reagent by alkaloids remain stable for at least one day and usually much longer (cover the chromatogram with a glass plate) [2, 6, 7]. The shade of color produced can be affected by fluorescence indicators incorporated in the silica gel layer [7]. Tertiary amine alkaloids do not react at room temperature with the acetaldehyde-containing reagent [2]. 

Narceine (h/ f 1-5) yielded red-brown, morphine (h/ f 5-10), codeine (h/Jf 15-20) and thebaine (h/ j 35-40) brown-violet, papaverine (h/ f 60-65) light brown and narcotine red chromatogram zones on a colorless background. Since the colors fade in the air it is recommended that the chromatogram be covered with a glass plate. 

Note The dipping solution can also be used as spray solution. Since the chromatogram zones slowly fade in the air it is recommended that the chromatograms be covered with a glass plate for long-term storage. Color differentiation is possible with purine derivatives [6, 8]. Diprophylline is not colored [6]. 

Note It is occasionally recommended that after it has been sprayed the plate should be covered with a glass plate for several minutes until optimum reaction has occurred [11], or be irradiated with long-wavelength UV light (X = 365 nm) [2]. Methanolic potassium hydroxide solution can also be used in place of sodium hydroxide [12] (see Potassium Hydroxide Reagent). The formation of colors and fluorescences depends on the length of heating and on the temperature employed optimum conditions must be discovered empirically [12]. 

Thin layer chromatography (TLC) uses the same principles as GC or HPLC but is performed on a glass plate containing an adsorbent, such as silica or alumina, that attracts other molecules to its surface. A small portion of the sample to be analyzed is spotted on the plate. The plate is placed upright in a tank containing a small amount of solvent that then rises up the plate and separates the components of the sample. The separated components can be located with an ultraviolet lamp or by spraying the plate with chemicals to produce color. 

Detonotion, Flash-Across, Heat Pulse and Hypervelocity Phenomena. According to Cook (Ref 3), the phenomenon of heat pulse was first recognized by Dr W.S. McKewan of NOTS, China Lake, Calif while viewing microsecond, color, framing photographs of Nitromethane (NM) detonated thru SPHF (shock-pass-heat-filter) glass plates in experiments conducted by D.H. Pack,... 

In 1890 Otto N. Witt advanced the theory that the dye dissolves in the fabric or the mordant, forming a solid solution. The chief argument in favor of this view was that the color of the dye on the fiber is that of the dissolved dye and not of the solid dye. Magenta, for instance, dyes a red and not a metallic green. Silk dyed with rhodamine fluoresces, while solid rhodamine does not, when obtained on a glass plate by evaporation of an alcoholic solution. 

The depth of color is determined as follows. The carbon black is rubbed with a binder (e.g., linseed-oil) to form a paste which is applied in a thick coat on a glass plate. A colorimeter is used to measure the diffuse reflection of light through the glass. The color depth and hue of the paste can be determined from the intensity and spectral distribution of the diffusely reflected light [4.32]. The color depth can also be determined by visual comparison of the paste with pastes of known blackness under very bright illumination. 

Color Plate 26 Thin-Layer Chromatograph (Section 25-1) The mixture to be separated is placed in tiny spots near the base of a plastic or glass plate coated with an adsorptive stationary phase. When the plate is placed in a shallow pool of solvent in a closed chamber, liquid migrates up the plate by capillary action. Different components of the mixture are carried along by the solvent to different extents, depending on how strongly they are adsorbed on the stationary phase. The stronger the adsorption, the slower a component travels. 

JLIFT GLASS PLATE. DROP INTO JAR APPLE PEELINGS AND MOISTENED, BRIGHT-COLORED FLOWER. COVER AGAIN WITH GLASS PLATE. IN A SHORT WHILE, COLORS HAVE BLEACHED. 

The crystals of 1 (0.635 g, 1.6 mmol) were placed between Pyrex glass plates and irradiated for 75 min with a 400-W high-pressure mercury lamp. After the irradiation the color of the crystals had changed from pale yellow to white and bis [2-(dibenzylamino)ethyl] c-2/-4-dibenzoylcyclobutane-r-1, t-3-dicarboxylate 2 was obtained quantitatively mp 143.0°C (from a mixture of dichloromethane and hexane). 

Grandjean texture upon shearing between glass plates. The Grandjean textures of some of the polymers changed color with temperature presumably as the pitch of... 

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