Going through an ancestors fiat collection (some partially non-fiat coins as well to be fair) and found some paper notes. Most I don't recognize other than a word (Belgium, France, Spain, Suisse, and at least one with what appears to be Arabic lettering). The older fiat coins were significantly more intricate compared to modern coins. I recognized this one but never seen anything like it.

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I think it's just black. The edges seem to have been dipped in wax or something for most of the bills. In another decade or so when I get to look at this again I'll put them in a book to flatten out.
The serial number… those are normal blue, red or green… I had to look it up… "Some variants of the 1935 dollar bill have brown seals. These Hawaii notes were used after the Pearl Harbour attack. North Africa notes had a yellow seal $1 bills were mostly used in World War II"
It is not only a silver certificate, but one overprinted "Hawaii" so that it could be repudiated if Japan managed to conquer that territory. A little over twenty years later, all Americans' silver certificates were repudiated.