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Showing results for tags 'ammonium chloride'.
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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 ammonium chloride and was unsuccessful. I tried placing the cast above the smoke, below and directly in front of the flask, nothing worked. I'm wondering if humidity could be an issue? Has anybody tried applying ammonium chloride as a fine liquid spray or magnesium ribbon? Any tips appreciated.
Fred posted a topic in Fossil PhotographyI 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 Zguid region (Morocco) I prepped a couple of years ago. I applied an ammonium chloride coating, after which I shot a series of 22 pictures using a DSLR with 150mm macro lens at f13. The focus point was changed manually over the series of pictures. Because the lens features an internal focus mechnism, the focal length also changed a bit, but this posed no problem for the stacking software. A simple setup was used, with the camera on a tripod, a remote flash and two reflection screens. Post-processing was mainly cropping, some minor retouching (dust!), desaturation and level adjustments. The first thing that came to mind when seeing the results, was that I should have cleaned the trilobite better before starting. Every little dust piece is visible. Auwtch. Lesson learned. The pictures: 1. Older picture showing the specimen without coating. No focus stacking, so limited depth of field. The angle of the picture is a little different. 2. Result after whitening, stacking and post-processing 3. Detail 4. Same but before post-processing. Any feedback is appreciated!