The front is printed in black and grey, it looks somewhat green from arms length, but there is no green except for the Treasury seals.
The back is printed using the same green color ink that was used on other denominations since the 19th century, hence the term "greenback".
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.
Dollar bills do not expire and can be used indefinitely.
The Treasury is authorized to print two dollar bills, should there be any need for them. There really isn't. They don't circulate much, and there's no point in printing bills that don't get used.
Dollar bills are not typically colored. They are predominantly green due to a green pigment that was used in the past to prevent counterfeiting. The green color has become associated with U.S. currency, though different denominations have slight variations in design and color.
No. The didn't print any bills dated 1940. In fact, $2 bills used a 1928 series date until 1953, regardless of when they were printed.
The colors used are red, blue and yellow ================ According to the US Treasury, only green and black are used on current $1 bills.
Only VERY indirectly, because the "paper" used for printing US bills is a mixture of cotton and linen. Because those are plants, they had chlorophyll when alive.
The currency used in America is the American dollar. It is in one dollar bills, five dollar bills, tens, twenties, fifties and hundreds,
Due to inflation, the $200 denomination has been proposed in the U.S. to augment $100 bills. However, neither the U.S., Australia, nor Canada print any bills larger than $100. The EU does print €200 notes but they are not commonly used.
Currency straps are used to bind dollar (and other denomination) bills in stacks.
Both coin an bills were used.
No. Watermarks are used only on $5 bills and higher denominations. The Treasury determined that the risk of counterfeiting low-value bills is so small that they don't have to be redesigned with more-sophisticated features like watermarks and color-shifting inks.