J. Planar Chromatogr. 7, 18-21 (1994). HPTLC of erythrosine on silica with ethyl acetate - methanol - NH3 25% 5:2:1. Densitometry by absorbance at 530 nm.

J. Planar Chromatogr. 12, 129 - 134 (1999). TLC of fluorescein acid, sodium salt, the dichloro-, dibromo-, diiodo-, tetrabromo-, and tetraiodo-derivatives of fluorescein on silica gel and C3 RP silica gel with micellar solutions of cationic, anionic and nonionic surfactants as mobile phases. The use of cationic and anionic surfactants has been found to result in dynamic modification of the silica gel surface which acquires reversed-phase properties.

Physical Testing and Chem. Anal., Part B: Chem. Anal. 45 (1), 14-18 (2009). TLC of ink extracts on silica gel with n-butanone - ethanol - water - acetic acid 14:4:6:1. Detection in visble light and identification by comparison of spot colors and hRf values. The method was used for the identification of 37 different black ink samples from gel pens from different sources, which could then be classified into 13 categories.

J. Liq. Chromatogr. Relat. Technol. 39, 549-557 (2016). Review of the use of TLC and HPTLC for the analysis of inks in forensic applications, including sample preparation, layers, sample application, detection, documentation and results interpretation. The author also described the application of TLC in food dye analysis as well as future trends in the field.

J. AOAC Int. 3, 686-694 (2018). HPTLC of 11 chemical dyes, namely, Sudan I (1), II (2), III (3), and IV (4); 808 Scarlet (5); Sudan Red 7B (6); malachite green (7); Basic Orange 2 (8); auramine (9); Orange II (10); and erythrosine (11) in traditional Chinese medicine raw materials and Chinese patent medicines on silica gel with cyclohexane – trichloromethane 7:3 saturated with ammonia vapor for the separation of (1) to (8). The plate was developed a second time in the same direction with ethyl acetate – alcohol – water – aqueous ammonia 16:4:2:1 for (9) to (11). Quantitative evaluation by densitometry from 200 to 700 nm. The hRf values for (1) to (11) were 74, 78, 74, 68, 44, 23, 8, 2, 56, 28 and 20, respectively. The LODs were 2 to 3 ng/zone, except for (6) 10 ng/zone. HPTLC combined with ESI-MS was assessed for proof of the effective separation of dyes and their identification in herbal matrices.

J. Chromatogr. 481, 331-342 (1989). TLC on silica with propanol - water - acetic acid in various proportions. Determination of their Rm values. Studies of linear free energy relationship with some electronic, steric and lipophilic parameters. Attempt of establishing the nature of dye-substrate adsorption by correlation with the theoretical charge densities. Studies showed that the steric factor has the greatest influence on the chromatographic behavior.

Chinese Anal. Chem. (Fenxi Huaxue) 21, 365 (1993). Ion-pair reverse-phase TLC of title compounds on a mixture of cross-linked polystyrene beads and silica with acetonitrile - water, containing ß-naphthalene monosulfonic acid and perchloric acid in concentrations between 0.005 - 0.045 mol/L. Discussion of the dependence of Rf values on the structure of the compounds, and the effects of solvent composition and pH value on Rf value.

Lab. Spe. Separation 1, 28-29 (2000). HPTLC of 8 disperse dyes (blue 1, blue 35, blue 106, blue 124, yellow 3, orange 3, orange 37/36, red 1) on silica gel with chloroform - ethyl acetate - n-hexane 6:3:2, bandwise application. Mixtures with coeluting dyes can be investigated using the AMD technique with multiple development (in 20 steps) with a gradient from methanol via dichloromethane to n-hexane. Quantification by densitometry at 254 nm.