I assume you will not be doing anything to the fossil without asking the curator's permission. I
have never seen this process. Let us know how it turns out if you do it.
On 3/24/10 5:38 PM, Morgan-Scott wrote:
> I have a question about fossil photography -- I have been working on a
> series of drawings of a small prehistoric mammal, Neocnus, from an on-loan
> specimen which is very fragile. This fossil drops flakes every time it
> touches the cotton pad it's sitting on.
> We photographed it and I have been using the photos for initial drawing
> set-up. However, eyeballing the fossil to get the shading is very difficult
> because of the coloration: the outside of the fossil is blackish, and the
> broken areas, of which there are many, are almost white. It's confusing to
> the eye and makes it take longer to complete the drawing.
> I know that fossils can be coated with ammonium chloride for whitening, and
> I've read articles which detail the techniques (vaporizing the ammonium
> chloride and airbrushing with powders) for applying it. The directions seem
> unnecessarily complicated to me but I've never watched anyone do it. The
> directions for airbrushing say to use "Bon Ami" scouring powder in alcohol!
> Why not titanium dioxide or even a bit of talc?
> Directions for removing coating simply say that "it easily brushes off."
> How easily? Any help would be appreciated!
> Thanks, Julia Morgan Scott
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