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Ammonium chloride - Fossil Preparation - The Fossil Forum
- http://www.thefossilforum.com/index.php?/topic/98960-ammonium-chloride/
- I am having trouble coating this Isotelus plaster cast. This is my first time attempting the ammonium chloride coating method. First I painted the cast with a thin layer of black acrylic (in retrospect, I probably should have used watercolor?). Then made a number of tries to coat the cast with am...
(PDF) Whitening fossils for photographic purposes
- https://www.researchgate.net/publication/325151591_Whitening_fossils_for_photographic_purposes
- A simple, and non-destructive, technique for whitening fossil specimens involves the application of ammonium chloride sublimate to the …
NPL Photography- Ammonium Chloride whitening - UT …
- https://wikis.utexas.edu/display/specify6/NPL+Photography-+Ammonium+Chloride+whitening
- Whitening equipment and setup for Ammonium Chloride: 1) Prepare camera for imaging. 2) Select specimens to be smoked - make sure they are clean. 3) Decide if they need to be blackened prior to whitening - …
Photography of plant fossils—New techniques, old tricks
- https://www.sciencedirect.com/science/article/pii/S0034666711000650
- In palaeozoology, fossils are frequently whitened with a thin coating of ammonium chloride (NH 4 Cl) or magnesium oxide (MgO) to obtain an evenly coloured fossil showing an enhanced relief under oblique lighting (Kier et al., 1965). When dealing with plant compressions, this method is generally to be avoided, because cuticles or other organic remains are easily …
AMMONIUM CHLORIDE | Photrio.com Photography Forums
- https://www.photrio.com/forum/threads/ammonium-chloride.180780/
- Per "The Nikon Manual - A Complete Handbook of 35mm Technique" (1957) page 283: Chemical-Physical D-76: The addition of 1 1/2 oz. per quart (40 grams/liter) ammonium chloride causes D-76 to behave partly as a physical developer: silver dissolved from the emulsion by the sodium sulfite is redeposited on the developing image as exceedingly minute particles …
Ammonium chloride in salt prints - Photrio.com Photography …
- https://www.photrio.com/forum/threads/ammonium-chloride-in-salt-prints.21636/
- A standard salt print; it's first a sodium chloride (NaCl) solution and then sensitizing with a silver nitrate solution. But, I have seen in several instances that ammonium chloride (NH4Cl) is used for the salting (giving a more red-brown tone and a slightly higher print speed, the sources say). The MSDS says it's a no-no to get ammonium ...
Experimenting With Whitening, Focus Stacking And ... - The Fossil …
- http://www.thefossilforum.com/index.php?/topic/53264-experimenting-with-whitening-focus-stacking-and-digital-post-processing/
- I had some fun yesterday combining fossil whitening techniques with focus stacking. I hope the result is interesting enough to share. I sure learned a whole lot by going through this process, and it was great fun too! So here is the story. The specimen is a Diademaproetus praecursor from the Foum...
A PRACTICAL AND HISTORICAL PERSPECTIVE OF THE HOW …
- http://fi.nm.cz/wp-content/uploads/2018/12/2_Parsley.pdf
- Ammonium chloride whitening is not limited to lithifi ed fossils and casts. Hegna (2010) has photographed lightly- sclerotized preserved modern crustaceans by fi rst staining the specimen, drying the surface of the animal with hexamethydisilazane, and then whitening the specimen using conventional heated NH 4 Cl or magnesium oxide smoke methods.
The Use of Polarised Light in Photography of Macrofossils
- https://onlinelibrary.wiley.com/doi/pdf/10.1111/1475-4983.00196
- History Museum for over 25 years one recurrent problem concerns the photography of macrofossils in which there is little contrast between fossil and matrix, and low relief. The object of this article is to ... meaning that low-angled lighting or coating with ammonium chloride would not significantly enhance the image. 1, specimen photographed ...
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