No. Many colors were used on silver certificates until colors were standardized in 1928, but purple wasn't among them. You may have a blue-seal bill that's changed color from age or being exposed to some chemical.
only one color
The official state colors are buff and blue. There are other colors on the seal as well, but those are the official colors.
if the seal is blue then yes. it's a silver certificate.
There are 7 different varieties of bill with that date, and different seal colors and series letters next to the date. The site linked below has a list of values:
Please check your bill again and post a new, separate question. The only seal colors used on 1934 A $5 bills were blue, green, yellow, and brown. The serial numbers will be the same color.
3 black and white "seal" and white and bridle and white
The blue seal indicates your bill is a silver certificate, a form of paper money issued until the 1957 series. Please see the Related Question for more information.
RED-The American seal, WHITE-The American seal, BLUE-The American seal.
There are many possible printing errors. Please post a new question with a description of the specific errors on your bill. bill has a teal dept of treasure seal and a purple federal reserve seal
The collector value of a bill isn't determined simply by its seal color. You need to know its denomination, its date, whether there's a small letter next to the date, and how worn it is.
As of 02/2009 U.S. Currency Auctions lists the price range for a circulated one as $55.-$70. depending on condition. Your bill is a Federal Reserve note in spite of having a blue seal. The Federal Reserve system had only been founded a year earlier and hadn't adopted the later standards for seal colors.