Same coin

MattandKim

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What would this be

Barberian

It's a quarter with some toning or compound added that appears like toning.

Why post this here?

MsMorrisine

I can’t explain the parallel streaking, but nothing the mint does would make it look that way.

Perhaps it once had a thin coat of paint. A/k/a surface contamination

ricko

Residues of some sort contaminating the surface. Not a mint induced condition. Worth a quarter. Cheers, RickO

WAYNEAS

It looks like a "fluorescent penetrate" coating used in metallurgy to find cracks, especially on welds.
The process is called "FPI" Fluorescent Pernitrate Inspection.
Wayne

Che_Grapes

It is a 99 Washington quarter with what appears to be motor oil or something on it

291fifth

Whatever caused it it is not an error and is worth only a quarter.

moursund

@Che_Grapes said:
It is a 99 Washington quarter with what appears to be motor oil or something on it

.
.
5 'W' quarters would be worth something.
5W20 quarters, not so much...

MattandKim

@Barberian said:
It's a quarter with some toning or compound added that appears like toning.

Why post this here?

I posted it asking coz I wasn't sure why it looks gold ... why ask me why I posted I'm new to doing this

MattandKim

1999 Quarters also had the errors due to the mint experimenting with the tone for the Sacagawea coins... I've seen a few like this before on forums and such ... only reason I asked

Oldhoopster

Spend some time studying the minting and die making processes. The more you know about how coins are made the easier it will be to spot real errors and understand which ones are minor.

Try these links for starters

https://www.coinnews.net/2014/01/06/how-the-denver-mint-makes-dies-to-produce-coins/

https://m.youtube.com/watch?time_continue=104&v=mqPvKxJXC_Y&feature=emb_title
(From the US mint)