Abstract
The quality of polished sections of limonitic plant petrifactions is improved by immersion of the sections in hot oxalic acid. This lightens the color of the matrix and increases the contrast with the dark cell walls.
Lawrence C. Matten; Improved technique for preparing iron hydroxide plant petrifactions. Journal of Paleontology 1966;; 40 (1): 225–226. doi:
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The quality of polished sections of limonitic plant petrifactions is improved by immersion of the sections in hot oxalic acid. This lightens the color of the matrix and increases the contrast with the dark cell walls.