Thirsty Boy
ICB - tight shorts and poor attitude. **** yeah!
- Joined
- 21/5/06
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Ozmick provided some nice info - you could get some minor "actual" caramelization happening in a boil - The phenomenon that Ozmick was talking about where the bubbles stick to the surface of the pot is known as Film Boiling. It is an issue in commercial breweries precisely because it allows higher surface temperatures in the pot and promotes burn on, this can affect flavour, does effect the efficiency of kettles and necessitates more intensive cleaning regimes. It is more common in direct fired systems, but can still happen with steam jacketed systems, one of the reasons they aren't all that common in big breweries anymore.
So if you were careful about stirring that involved scraping the bottom of the pot, you might be able to scrape up small amounts of true caramel and dissolve it into the wort before it just turns into char.
Film boiling usually occurs where there is to high a heat flux and where the surface is not very "wettable" - so the perfect conditions for it would be ... a thin walled, stainless pot, with an intense heat source over a small area. All that would add up to burn city under normal circumstances... but if you are diligent about scrape/stirring the pot while its boiling, you might make it work to your advantage. Consider the old fashioned kettles that had rotating arms trailing lengths of chain - they constantly scraped the bottom of the kettle during the boil for exactly this reason.
Also, the mailiard products produced during an intense, concentrated boil, are going to be quite different to the ones produced in a normal boil. Mailiard products depend on the moisture levels, the sugar concentration, the amino acids and their concentration, the temperature, the pH. You will get quite different ones in a very sugary, higher than 100C (from high sugar concentration) relatively low moisture - first runnings concentration boil, than you would by boiling a more dilute wort for hours and hours.
So you wont be able to emulate the flavour of someone who does an extended length boil, by boiling a concentrate - and visa versa. If you were trying emulate bribie .. you would have to take a sample of the whole, mixed wort and boil that ... because thats what he does (BIAB) - taking first running would produce a different result.
So if you were careful about stirring that involved scraping the bottom of the pot, you might be able to scrape up small amounts of true caramel and dissolve it into the wort before it just turns into char.
Film boiling usually occurs where there is to high a heat flux and where the surface is not very "wettable" - so the perfect conditions for it would be ... a thin walled, stainless pot, with an intense heat source over a small area. All that would add up to burn city under normal circumstances... but if you are diligent about scrape/stirring the pot while its boiling, you might make it work to your advantage. Consider the old fashioned kettles that had rotating arms trailing lengths of chain - they constantly scraped the bottom of the kettle during the boil for exactly this reason.
Also, the mailiard products produced during an intense, concentrated boil, are going to be quite different to the ones produced in a normal boil. Mailiard products depend on the moisture levels, the sugar concentration, the amino acids and their concentration, the temperature, the pH. You will get quite different ones in a very sugary, higher than 100C (from high sugar concentration) relatively low moisture - first runnings concentration boil, than you would by boiling a more dilute wort for hours and hours.
So you wont be able to emulate the flavour of someone who does an extended length boil, by boiling a concentrate - and visa versa. If you were trying emulate bribie .. you would have to take a sample of the whole, mixed wort and boil that ... because thats what he does (BIAB) - taking first running would produce a different result.