China was the first country to use paper money. As early as the Song Dynasty, banknotes at that time had seals. Throughout the world today, all banknotes need to be stamped or signed to take effect.
Extended data:
The popular counterfeit hundred-dollar bills in the market usually have the following characteristics:
1. Printing and paper. The counterfeit money with the crown number is machine-made offset printing, and the paper is fragile and inflexible.
2. Watermark, fixed portrait watermark and "100" white water print are printed directly on the front of the paper with colorless ink, and the watermark is blurred and has no three-dimensional effect.
3. Forged the safety line. There are two kinds of anti-counterfeiting lines for counterfeit coins with crown number: one is to use silver-black tape to clamp them in the paper on the front and back, and use silver ink to hot stamp holographic patterns on the back; The other is to print black stripes on the front of counterfeit money with black ink, and hot stamp holographic patterns with silver ink on the back, and brush with magnetic powder.
4, optically variable ink denomination figures, printed with pearlescent ink, no optically variable effect.
5. The complementary pattern of Yin and Yang is misplaced.
6. The concave-convex feeling of counterfeit money is pressed by hard metal mold.
7. Invisible denomination figures are printed in colorless ink, and the words "100" can be seen without rotating the angle.
References:
Baidu encyclopedia-counterfeit money