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On worked sandstone, rain and sun exposed slanted face of a gatepost (#262)
Control
Strong red reaction to C in the cortex to gyrophoric acid.
Partially shaded Gneiss, vertical surface. (#131)
(Lugol) I+ persistently blue on very low concentrations
Lugols stain in normal concentration developing under the coverslip with a blue, green to red gradient.
Lugols stain in normal concentration developing under the coverslip with a blue, green to red gradient.
Lugols stain
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