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Showing results for tags 'stain'.
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Removing yellow staining/iron(hydr)oxides from competent shale
paleoflor posted a topic in Fossil Preparation
L.S., Last fall I've collected a number of plates with sphenopterid foliage from the Piesberg (see photos below). While some of the specimens occur in high-quality rock (e.g., Specimens A-C), others show extensive yellow coloration due to water permeation and creation of "rust minerals" (mostly limonite-type minerals). In Specimens D and E, in particular, this mineralisation obscures the detailed morphology of the plant fossils. Does anyone have experience with removing yellow stains from shale-type rocks? I've been reading about rust removers for pavement and garden rocks but would like to inform myself as best as possible before starting a few experiments on leftover fragments. My goal would be to remove the stains to the point where I can more clearly see the plant imprints. These plants occur in quite competent shale. I think it can easily survive being wetted, but complete submersion for extended periods of time would probably be a bit much... Thanks for your help! Tim Specimen A - part and counterpart Specimens B and C Specimen D - part and counterpart Specimen E- 6 replies
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Last one and I swear I’ll stop asking questions. This is the track in question about it being lightly stained and what you thought about staining. Is this a real trace fossil that you can tell of? If so is this light staining acceptable?
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What’s your idea on buying a fossil that’s been stained? Yes no maybe? i been looking at tracks that say they have been lightly stained and to tell the truth I have a hard time making out a track without it being stained.