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For the simple reason that if it were public knowledge it would be far easier for counterfeiters to duplicate real dollar bills.

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Q: Why is the formula for the dollar bill's ink a secret?
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Related questions

Do dollar bills have gold in them?

No. Some higher denomination bills have color-shifting ink with a tiny amount of metal in it, but no gold.

Does America really import ink to make dollar bills?

Yes. They do. There is a company called SICPA from Switzerland.

1953 red ink 5 dollar bill?

In 1953, several series of American bills with red ink on them were circulated to the public. Today, these bills are worth between 6 and 15 dollars, depending on condition.

What products can you use to remove ink from dollar bills?

It is illegal to tamper with currency in most countries. Any attempt to alter or remove ink from dollar bills is considered illegal and can result in criminal charges. It is recommended to use the currency as intended and not attempt any alterations.

What is the wax feeling on dollar bills?

It's due to the special green ink and the finish that's used on banknote paper.

Is the ink on dollar bills magnetic?

No. Despite many Internet conspiracy rumors claiming otherwise, US bills do not have magnetic ink, bar codes, or RFID chips. Modern bills $5 and higher DO have special strips that glow under UV light and watermarks, and bills $10 and higher have special inks that change color when you tilt the bill.

What is the value of a 1963 five dollar bill with the Serial number in red ink?

The $5 bills are worth a price close to $15 each. The price of the $5 bills will vary depending upon their condition

What is a Two dollar bill with yellow ink?

A 1963 2 dollar bill with yellow ink is considered very rare since it was an ink error. It escaped the quality control of the US mint and should not have been released. 1963 2 dollar bills were printed with red ink. It would be worth a premium price to a collector the better the condition, the higher the value.????There are no known reports of ink errors on 1963 US $2 bills. And more importantly, the US Mint DOES NOT MAKE PAPER MONEY, it only strikes coins! ALL US paper money is produced by the Bureau of Engraving and Printing. The last time yellow ink was used on US bills was during WWII to create special bills for use in war zones. More likely, the bill has simply been exposed to something (bleach, laundry detergent, etc.) that leached some of the color out of the seals.

Do you have a 5 dollar bill with red ink made in 1967 in the US?

No such bill exists. The last red-seal $5 bills were dated 1963, and no US bills of any denomination carry a 1967 date.

What is the value of a 1959 US 10 dollar bill with blue ink?

Please check again and post a new question. It's either not 1959, not $10, or not blue ink. The US didn't print any bills dated 1959, the last blue-ink silver certificates were $1 bills dated 1957 and the last $10 silver certificates were dated 1953.

What is the value of a 1953 B US 1 dollar bill with blue ink?

There were no $1 bills printed with that date. Please check again and post a new question.

How much greater is the value of 100 kilograms of ten dollar bills than 100 kilograms of one dollar bills?

If we assume that the mass of paper is the same in a bill of each denomination, andthe mass of ink in each is also the same, then the value of any mass of $10-bills is10 times the value of the same mass of $1-bills.So the difference in their value is nine times the number of bills in either pile.