Guides · Keeping receipts
The receipt that went blank in your wallet.
Thermal paper does not fade slowly and politely. It is legible for weeks and then, after one hot afternoon in a car, it is a plain grey rectangle — and it is usually the one receipt you needed.
Why it happens
It is not ink, and that is the whole problem.
A store receipt is not printed. There is no ink on it. The paper is coated with a dye and an acid that react when the print head heats them, and the dark marks you read are that reaction. Anything that repeats the reaction across the whole sheet turns it black; anything that undoes it turns it blank.
So the things that kill a receipt are ordinary. A dashboard in the sun. A jacket pocket against a radiator. A wallet carried in a back pocket, where it gets warm and bent. A slip folded against a credit card. Hand cream, hand sanitizer, friction.
A receipt does not have to be old to be gone. It has to have been warm.
Which also means there is no trick for getting one back. The dye has reacted. Nothing prints itself again.
The day you get it
Photograph it in the parking lot, not at the weekend.
This is the entire answer and it is unglamorous. A receipt photographed the same day is a fact. A receipt you mean to deal with on Sunday is already an estimate, because by Sunday you will be reading a paler version of it and remembering the rest.
It takes about four seconds, and it is worth doing for the slips you would not bother filing at all — the ones that matter are never the ones you expected. The parking receipt matters when the claim is refused. The hardware slip matters when the part fails.
A photograph does not have to be tidy. Creased, folded, at an angle, in bad light: that is the normal case, and any reader worth using is built for it.
Once it has already faded
What can still be recovered, and what cannot.
Try the photograph anyway, and try it in even, indirect light rather than with a flash. A flash bounces off the shiny coating and washes out exactly the faint marks you are trying to keep. A grey slip under a window often reads better than the same slip under a lamp.
Raising the contrast afterwards sometimes brings back a total that the eye cannot see. Photocopying rarely does, and a copier that runs warm can finish the job of erasing it.
Do not apply heat deliberately. The advice to warm a faded slip with a hairdryer or an iron is real, but it is a one-way bet. Heat darkens the whole sheet, and once it has gone past the point where the printed marks still stand out, there is nothing left to read. You get one attempt, and you usually lose it.
If the slip is gone, the shop may not be. Many stores can find and reprint a receipt from the card that paid for it, usually within a few months. It is worth asking before assuming the purchase is unprovable.
Without the paper
What a bank statement does and does not prove.
A card statement proves that you paid a certain amount to a certain shop on a certain day. That is often enough for a warranty claim, a reimbursement, or a personal record of what a month cost.
It does not prove what you bought. Every line, the tax, and any discount live only on the slip. So a statement is a reasonable fallback for the total and a poor one for anything counted item by item — which includes most expense claims and any split with other people.
For how long a slip is worth keeping at all, and for what, there is a separate guide on how long to keep a receipt.
Straight answers
Common questions
Why has my receipt gone completely blank?
Heat, almost always. Thermal paper darkens when it is warmed and the coating breaks down when it is warmed a lot, so a slip left in a car, against a radiator or in a warm pocket can turn uniformly pale or uniformly grey. Sunlight, friction and some oils and solvents do the same more slowly.
Can a faded thermal receipt be restored?
Not reliably. The marks are a chemical reaction in the coating rather than ink sitting on the surface, so there is nothing to lift or re-develop. A careful photograph with the contrast raised can sometimes recover a total that the eye cannot see; heating it is a gamble that usually erases the rest.
Is a photograph of a receipt good enough?
For your own records and for most warranty and reimbursement purposes, yes. Whether a particular shop will accept one for a return is the shop’s own policy, and many will instead look the sale up from the card you paid with. Tax rules are their own subject and differ from country to country, so check the tax authority where you live.
Should I keep the paper after photographing it?
For an ordinary purchase, there is little reason to. For anything you may need to prove later — a large item, a warranty, a claim — keep the paper as well until the reason has passed. Store it away from heat and light and not pressed against a card.
Do receipts printed on ordinary paper fade too?
Far less. A laser or inkjet receipt is ink on paper and behaves like any other printed document. It is the glossy, slightly slippery slips from a receipt roll that are thermal, and those are the ones worth photographing the same day.
Where ExpenseGauge fits
It reads the slip while the slip is still readable.
The habit is the hard part, so the app is built around the four seconds rather than around the filing. One photograph, and the shop, the date, the tax, the discounts and every printed line come off the paper and into your books, where heat cannot reach them.
And it tells you when it could not read something rather than filing a guess. When the lines and the total do not agree, the receipt says so in plain words — including the case this guide is about: a line that has rubbed off, or a discount written inside another line. Those receipts are kept together in a folder of their own, so a slip that needed a second look can be found later instead of by accident.
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