Half a croissant, on a plate, with a sign in front of it saying '50c'
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Ultraviolet food portion marking

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Many food products, such as pies, pizzas, cakes and tarts are supplied as a large single item for subsequent subdivision by the end user.

Quite why this is so is mystifying to us - the obvious action is to sneak off with the entire pie and scoff it in secret.

However, to pander to the peculiar predilections of you species, we suggest that such items are marked on their upper surface with a pattern of radial lines using UV ink. When illuminated with UV, this will disclose an inner ring of lines of originating at the centre, indicating cut positions for even fractions (1/4, 1/6, 1/8, 1/10) and around the circumference inward lines for the odd fractions (1/3, 1/5, 1/7)

One double width line runs from the centre to the circumference, representing the zero datum.

8th of 7, Jun 11 2016

Prof Stewart's book https://global.oup....5905?cc=gb&lang=en&
Highly recommended [bhumphrys, Jun 11 2016]

Cake vid https://www.youtube...watch?v=wBU9N35ZHIw
how to avoid dryness [bhumphrys, Jun 11 2016]

[link]






       Yes, but then you'd have to go and find your UV lamp, then realize the fuse in needs changing, then find a way to hold the lamp in the right place while you cut the pizza, then discover that you can't actually find your pizza cutter... The whole thing would become too protracted.
MaxwellBuchanan, Jun 11 2016
  

       // go and find your UV lamp //   

       Just use the UV illuminator mounted on the side of your head.   

       // The whole thing would become too protracted. //   

       That's just your angle on it.
8th of 7, Jun 11 2016
  

       The whole thing would become too protracted. [+]
Voice, Jun 11 2016
  

       [+] despite tending towards //sneak off with the entire pie// personally.
FlyingToaster, Jun 11 2016
  

       //inward lines for the odd fractions (1/3, 1/5, 1/7)//   

       The easiest way to cut a pizza into, say, three parts is to first cut it in half, then cut one of the halves in two for your guests.
MaxwellBuchanan, Jun 11 2016
  

       // pizza // // guests //   

       But they are mutually exclusive...
8th of 7, Jun 11 2016
  

       There is an interesting alternative proposal (on the link) and also a loveley book by Prof. Stewart headlining the topic.
bhumphrys, Jun 11 2016
  

       This is an awesome idea. Seeing the portions are calculated electronically, you could devise non-symetrical, wavy-lined odd shapes which are nevertheless of equal area.
AusCan531, Jun 11 2016
  

       or liquidise the pie & use a measuring jug?
Skewed, Jun 12 2016
  

       one cuts, the other chooses
popbottle, Jun 13 2016
  

       ... bearing in mind that the one that cuts still has the knife.
8th of 7, Jun 13 2016
  

       wow, during a previous century I thought that microwave ovens could read IR (nonvisble ink) patterns off the upper surfaces of food packaging, then customize beam strength that way the ice cream could remain frozen while the vegi-burger is warm!   

       I like [Ian Tindales] idea of feeding bees with UV highlighted snacks though!
beanangel, Jun 17 2016
  
      
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