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<p>[QUOTE=&quot;Numbers, post: 25767506, member: 11668&quot;]Some of the earliest Federal currency, in the 1860s and 1870s, used a green &quot;protector&quot; tint on the face side, to thwart photographic counterfeiting.&nbsp; The overlapping black and green printings just looked like a muddled mess to the black-and-white cameras of the day.</p><p><br /></p><p>But the ink used for the green tint had a tendency to show through on the backs of the notes.&nbsp; To hide it a bit, the backs were printed in green ink.&nbsp; That started the tradition of green backs that&#039;s still going strong today.&nbsp; Though there <i>have</i> been a few exceptions over the years -- Brownback NBNs, yellow-back gold certificates, and so forth.[/QUOTE]</p><p><br /></p>

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