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Brooker's merocyanine dye is used as solvent polarity indicators. It is used as pH sensors and transition metal cation indicators.
Viviane Cavalli; Domingas C. da Silva; Clodoaldo Machado; Vanderlei G. Machado; Valdir Soldi. The Fluorosolvatochromism of Brooker's Merocyanine in Pure and in Mixed Solvents. Journal of Fluorescence.2006, 16 77-86.
John O. Morley; Richard M. Morley; Robert Docherty and Michael H. Charlton. Fundamental Studies on Brooker's Merocyanine. J. Am. Chem. Soc.1997, 119 (42), 10192-10202.
Hazard Statements: H302-H315-H319-H335
Harmful if swallowed. Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P280a-P305+P351+P338-P304+P340-P405-P501a
Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.