Oh dear 
the shame
Bleach maybe 
Iām genuinely wondering what kind of leather wallets people have in what finishes. I would love to know what actually causes that!
(For what itās worth, my metal card looks pristine after a whole year of active use in a black leather wallet, minus the usual faint contact lines along the chip and very light marks on the back from it hitting things.)
At least itās not vegan leatherā¦ aka NOT LEATHER! But a weird substitute that costs more than leather
Unless itās made from real vegans of course
The only issue i had with my Metal Card is that a card reader scratched it. In terms of keeping it clean Iāve not had any issues with discolouration as such. They allow the option to change back to a coral plastic card now for free if you want a free replacement.
I could be wrong but if your card is stolen then the replacement fee is waived?
Im not 100% sure in that one though. I think Monzo should offer a black alternative or some different colours that donāt discolour easy like Curve offer Red and Blue.
Oh, Iāve just remembered my own solution from earlier:
Another solution would be to stick it in a drawer at home and then pay with Google/Apple pay everywhere 
There are different grains of leather and different ways leathers are either dyed or painted.
Which could affect cards differently
The cards arenāt staining themselves though, are they?
A self staining cardā¦If I could prototype that and get a patent, by next year I could beā¦still broke.
Except these are produced by a different company entirely to the previous 3 manufacturers of the coral + plus cards 
Itās Monzoās new initiative when cancelling - instead of sending unnecessary cards, they just trigger the current one to ruin itself. Itās all about that image!
There must be a German word for thisā¦ all the āwe want metal cardsā to thisā¦ couldnāt make it up.
WirWollenKreditkartenmetall?
Monzo should really use this to get one over on Apple here. The obvious solution is to include a tin of this with every card they send outā¦
I get your point about an FYI, but to me it just seems like a glaring issue to design a product that isnāt compatible with possibly the top two places said card will be stored.
Maybe not the best analogy, and the stakes certainly arenāt this high - but imagine if you just bought a car and after you signed a contract, they said they paint would possibly flake off if you drive about 40mph. And it will now cost you to cancel if you decide thats a problem.
I can see why folks would be annoyed - whether you are in the āI really wanted a metal cardā camp or not - if youāre told itās a premium card, and itās so premium it costs Ā£50 to replace and has a 5 year life. But in the first month your wallet does this to itā¦ I think Iād be annoyed too.
Edit: And it probably should bother me less than it actually does. Not sure why but this specific thing just bugs me an irrational amount.
The thing I donāt get is that it didnāt have to be white/light. Why not make it a dark colour?
Iāve had mine for almost an year now, in a black leather wallet, and I have never had to clean it. Iām curious if it only affects brown leatherā¦
As would I. If you are paying for a premium product, Iād expect something better than the bog standard product.
Functionally, a metal card is no different to a plastic card, so the premium feature is the look and feel. But if that wears off, whereās the premium value?