Seals

I'm not sure what you mean by "any other note withou color during that time", but if you are asking what the various seal colors indicate...

BLUE seals were generally used for Silver Certificates, meaning that they could be redeemed for an equivalent amount of silver coinage when presented at a bank.

RED seals were generally used for Legal Tender Notes (also known as United States Notes). Legal Tender Notes were created as fiat currency, meaning that they represented a "bill of credit" and were inserted by the Treasury directly into circulation free of interest, with no guarantee that they could be be redeemed for precious metal.

GREEN seals were generally used for Federal Reserve Notes, issued by specific regional Federal Reserve Banks (as noted within the black seals on the left side of the front).

GOLD seals were generally used for Gold Certificates, meaning that they could be redeemed for an equivalent amount of gold coinage when presented at a bank.

BROWN seals were generally used for National Currency notes, issued by a wide variety of "First National Bank of ..." banks.

Then there were a few special cases, such as the yellow seals used for North African "Emergency Notes" and the brown seals used for Hawaii "Emergency Notes" during WWII.

Lots of exceptions to all the things I just said, but I think that's a good overall general picture.