What happened to the new multi-colored hundred dollar bills we were supposed to get a few years back?

I don’t think they ever got congressional approval to make the change to the multi-colored format.

I wish they had, it would make counterfeit bills much more difficult to create.

They are colored, aren’t they? I haven’t handled cash very much the last few years, but the ones I remember seeing were different colored. According to the Bureau of Engraving, the colors are easier to duplicate.

“The newest $100 bill was announced on April 21, 2010 and was to enter circulation in early 2011.[5] In addition to design changes introduced in 1995, the obverse features the brown quill that was used to sign the Declaration of Independence; faint phrases from the Declaration of Independence; a bell in the inkwell that appears and disappears depending on the angle at which the bill is viewed; teal background color; a borderless portrait of Benjamin Franklin; and to the left of Franklin, small yellow 100s whose zeros form the EURion constellation. The reverse features small yellow EURion 100s and has the fine lines removed from around the vignette of Independence Hall. These notes will be issued as series 2009 with Rios-Geithner signatures. Many of these changes are intended not only to thwart counterfeiting but to also make it easier to quickly check authenticity and help vision impaired people.[8] Problems in the printing process has led to a delay in the release of the new bills.[9] As of January 2nd, 2012, no release date has been set for the new $100 bill.”

Wikipedia

Oh, I’m answering the question the wrong way again, on my first reading, I thought it meant all currency. My bad

They cost too much to make

I never heard about that, but yes it may have added some color to our world.