If you want to get fresh rub my bumps!

[vetran]

Not so helpful for blind people.

I use the sniff test.

The bumps are for the blind.

yes but colour is very useful for supermarket staff who can quickly review packets visually.

The beauty of the design is it decays at the same speed so if someone takes a packet out of the fridge and decides they don't want it and leaves it on the side the label records the degradation.

[d000hg]

Not so helpful for blind people.

No, but the other 95%+ of the population might appreciate a more immediate indicator given that you often cannot tell food is safe by looking at it, especially in a sealed packet.

Although... why don't packages put the use-by-date in braille? Or do they and I never noticed?

[mudskipper]

You could make a variant which changes colour, so the packaging shows a huge skull and crossbones as the food goes off.

Not so helpful for blind people.

I use the sniff test.

[d000hg]

You could make a variant which changes colour, so the packaging shows a huge skull and crossbones as the food goes off.

[quackhandle]

Heard about this on R4 this morning, very well deserved, fingers crossed it makes it to market.

qh

[vetran]

'Bump Mark' label can tell you whether your food is off with the swipe of a finger  | Daily Mail Online

Is this the end for use-by dates? Young inventor develops 'Bump Mark' label which can tell you whether your food is off with the swipe of a finger
Solveiga Pakstaite's label changes texture as food inside packet goes off
Sticker starts off smooth but over time develops bumps as gelatine decays
The 22-year-old graduate was inspired after working with blind people
She is the British winner of James Dyson Award for product design
Miss Pakstaite has won £2,000 in prize money and has applied for a patent

absolute genius.