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| Black Walnut; The brown stain found in the green husk of black walnuts contains organic IODINE | |
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| Tweet Topic Started: Mar 17 2011, 07:14 AM (8,145 Views) | |
| yass | Apr 19 2011, 12:38 PM Post #21 |
'night owl'
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Well, I went through some expense to find out for myself whether black walnut hulls contain iodine. I would be testing black walnut hulls, watercress, which I read was a source of iodine, and tincture of iodine, using iodine test strips which test from 0.0 - 5.0 ppm (parts per million).  I put a tablespoon of black walnut hulls in 5 ounces of boiling, filtered (was going to use distilled but didn't) water, turned it down to a simmer and let it simmer for about 12 minutes. The result was a very dark liquid. The strip you see in the following picture is the back side of a new, unused, test strip. I didn't realize it was the back side right away until I got to looking at the directions a bit more and studying the strip. Note the dark brown stain it created on the cheese cloth. I can understand why the natives used it for a brown dye for garments and textiles.  It was so very dark I feared it was simply going to obscure any results on the test strip as you'll observe on the test strip in this image.  Here are the test strips, left to right, of: black walnut hull undiluted, black walnut hull diluted, watercress undiluted, and tincture of iodine diluted.  I've enhanced to try and bring out the colors a bit better will put in next post. |
| -Love will lead | |
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| yass | Apr 19 2011, 01:03 PM Post #22 |
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'night owl'
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This has been in paint for adding text, then another program to enhance with gamma and contrast. Even in person I had a difficult time with these colors. The only one that was apparent about containing iodine was the tincture of iodine. Go figure.  Far right: the tincture of iodine is a bit marbled and matches the colors on the bottle that are 0.5 and 1.0  After the first testing of the black walnut hull liquid I diluted it by adding one teaspoon of it to two teaspoons of water. It was a lighter brown. In the test strips, absence of iodine is a yellow color and presence of iodine is a green color. I tried very hard making out green but I couldn't do it. The watercress which for some reason I don't have pictured in it's glass was a yellow colored liquid that tested out as a yellow colored dot on the test strip consistent with 0.0 level of iodine. I did the same with the watercress as I did with the black walnut, putting a tablespoon of watercress in 5 ounces of boiling, filtered water and turning it down to simmer for about 12 minutes. It had a very pleasant aroma to it. It's possible that I'm not doing it correctly, or perhaps I need to use some other solvent besides water, like alcohol, vinegar, or glycerin. I diluted the tincture of iodine same as I diluted the black walnut hull liquid by adding a teaspoon of tincture of iodine to two tablespoons of filtered water. I've since located an 'ask a scientist' site (chemistry related) and explained some of what I was trying to accomplish and asked what you do when the liquid you're testing is a dye. So, that's it for now. Those strips are a bit spendy something like $17 for 50 strips. |
| -Love will lead | |
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