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#1 Simon

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Posted 23 February 2008 - 02:47 PM

During a reflective moment whilst eating my pub lunch today I found myself reading the label on a bottle of Heinz Tomato sauce. Amongst the several warnings on this highly dangerous foodstuff it said ‘once opened keep refrigerated and consume with 8 weeks’. Now I wager nobody (well very few people) in the world keep their tomato sauce (ketchup) in the fridge. If this control is really necessary to maintain the safety of the ketchup why is it we are all not getting sick? As we are not can we conclude Heinz is being lazy with their labelling?

Have I got too much time on my hands? :dunno:


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#2 foodmanuk

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Posted 23 February 2008 - 08:08 PM

Simon,

your point is a fair one, we now have a warning on coffee that it may be hot, and of course I won't mention the n*t word. However in this case I'm guessing you are wrong. I suspect that Heinz has succumbed to pressure to reduce the salt level of their ketchup and possibly the acidity these being factors determining the ketchups stability and safety. If I remember correctly (I'm not going to check my texts) that there are two CIMSCEE formulae that determine whether a sauce was intinsically stable/safe. The parameters affecting this included; Salt, sugar, oil & available water.

Anyway might just be worth keeping the ketchup in a fridge!



#3 Charles.C

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Posted 24 February 2008 - 08:09 AM

Dear Simon,

It seems that a lot of other people also hv reflective moments near bottles of ketchup. :biggrin:

The first link below contains a half-answer from the tomato's mouth -

http://answers.yahoo...03224529AAtN4wB

http://answers.yahoo...08071326AAR4NZO

and an even more in depth poll which is actually quite informative, food science-wise, -

http://ask.metafilte...ill-safe-to-eat
(particularly the bottom two posts!!)

On a related issue, I also noticed this fascinating professional ketchup advice in the wiki link above, shud be good for some curious glances in the pub (unless UK has the squirty type) :smile: -

Ketchup (the tomato variety) is a thixotropic substance, which often results in difficulties of removing it from a glass bottle. Often a glass bottle will appear to be blocked. The "common" method (inverting the bottle and hitting the bottom with the heel of the hand) will cause the ketchup to begin flowing over itself. Because the ketchup is a thixotropic fluid and has a non linear stress strain curve it will flow over itself better than anyother surface. So once it begins to flow it will pick up speed, and this is why a whole lot of ketchup comes out at a time. Some people, seeking to avoid this problem, remove the product with the aid of a butter knife thrust into the opening. But this technique is generally slow and inefficient, and can potentially contaminate the ketchup.

There is a better technique that avoids both the thixotropic effect and the need for an inefficient tool. Known widely among caterers, it involves inverting the bottle and forcefully tapping its upper neck with two fingers (index and middle finger together). Specifically, with the Heinz Ketchup product, one taps the 57 circle on the neck. This helps the ketchup flow by applying correct G-forces.[10]
(Another solution to this problem appeared with the introduction of plastic squeeze bottles. More recently, Heinz and others have introduced an "upside-down" bottle, which further remedies the problem by keeping the remaining ketchup at the mouth of the bottle. These bottles are also fitted with a control valve in the nozzle designed to eliminate the build-up of ketchup in the cap after use. This, however, leads to squirt control problems)

Rgds / Charles.C


Kind Regards,

 

Charles.C


#4 Simon

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Posted 24 February 2008 - 09:24 PM

your point is a fair one, we now have a warning on coffee that it may be hot, and of course I won't mention the n*t word. However in this case I'm guessing you are wrong.

I know you're new around here, but do you know who I am? Oh the sauce! :lol:

Anyway might just be worth keeping the ketchup in a fridge!

Thanks for the advice foodmanuk. I guess the same applies to the daddies? Cold sauce on bacon butties, I'm not convinced.

@Charles. Once again your exemplary powers of research are proven. Obviously lot’s of people with too much time on their hands. :rolleyes:

Regards,
Simon

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