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Questions about Uruacu - Shiny Black Inclusions / Images / Etching


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I am processing some Uruacu and some of the pieces have huge shiny black inclusions that almost have a mirror like reflective surface.

Does anyone know what these are, you can see a lot of them in this 354 gram slice:

354grSlice1.jpg

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Does anyone have any tips on photographing this material. It doesn't have a lot of contrast but the etch looks 1000% better then what this image shows:

354grSlice2.jpg

I have tried shooting it from various angles, with and with out flash, inside, outside, nothing seems to really capture the look of the etch

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Speaking of the etch, does anyone have any ideas on how to get more contrast, I have tried a variety of Nitric Acid and Ferric Chloride Solutions and I have even tried various combination of both.

If anyone can offer any help it would be greatly appreciated.

Thanks

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