Voss Kveik-gær (WLP520) - Økologisk PurePitch Next Gen

WLP520 - Voss Kveik-gæren er en af tre nye Kveik-gær fra White Labs. Den er en meget traditionel kveik-gær, der producerer de klassiske earthy og appelsin-agtige noter, der kendetegner de mest kendte kveik-gær.

WLP520 egner sig derfor godt til en masse forskellige stilarter hvor man ønsker disse noter, men specielt i IPA'er og Pale Ales klarer den sig godt.

KVEIK gær udmærker sig ved at den nemt, hurtigt og effektivt kan gære i et varmt miljø, faktisk helt op mod 40 (FYRRE) graders varme.

Fermenteringen starter EKSTREMT hurtigt, som i indenfor 30 minutter, og du kan rent faktisk høste gæren SAMME dag som du tilsætter den, søg på nettet og du vil finde dokumenterede beskrivelser hvor gæren er høstet 40 minutter efter tilsætning.

De primære "features" om KVEIK

- Fermenteringen starter hurtigt, typisk indenfor 30 minutter, og indenfor 3 timer vil der være synlig aktivitet
- Gæring er typisk afsluttet indenfor 2 døgn (eller mindre)
- Øllet modnes LYNHURTIGT, er typisk klar på 36 til 72 timer! Også kaldet Oppskåke, hvor Kveik føres fra primær gæring til eksempelvis trætønder, hvis det altså når så langt... som til trætønderne... :-)
- Alkoholtolerencen er som altid miljøbestemt, men den ligger mellem 8 - 12% (og det er altså indenfor de nævnte 2 døgn gæring)

Det første du skal være opmærksom på er at KVEIK gær ikke er en SPECIFIK gærstamme, men en af flere, skal vi kalde det, (af)?arter af
samme gær, de kommer i en del forskellige varianter, flere af de originale KVEIK kommer også med bakterier.

KVEIK er en (historisk) Farmhouse Ale type! Men kan sagtens bruges til andre øltyper, det er helt op til dig, men ønsker du at lave en Kveik og holde denne "Ølstil" i fokus, så bør du (meget mod tidens trend) minimere humleprofilen, både den bitre men også den aromatiske såvel som tørhumling.

Men som nævnt kan du sagtens bruge den på andre øltyper, og den oplagte fordel her er jo at du ikke behøver at bekymre dig om temperaturen, og så kan du altså have en færdig øl på UNDER 1 uge! så Kveik var oplagt at benytte i sommeren 2018 :-D

Opshaug stammer fra Strada i Norge, Harald Opshaug og blev op gennem 1900 tallet benyttet til at lave kornøl (Høstøl) i mange varianter.

OBS! *** Alle flydende gær sendes med køl for bedst muligt at sikre kvaliteten frem til dig


Attenuation: 75-83%
Flokulering: Medium til Høj (Gærens evne til at bundfælde)
Optimal fermenterings temperatur: 22 - 37 grader celcius
Alkohol Tolerance: Medium 10 - 15%

Hvad betyder?

Attenuation? = Forgæringsgrad, hvor meget sukker kan gæren omsætte til alkohol (Co2 og smag)
Flocculation? = Gærens evne til at samle sig og bundfældes, og på den måde opnå en mere klar øl.

Substitut: Høst gæren, enten som slurry eller lad den tørre ind og læg den i fryseren, den kan holde sig i minimum 1 år på køl, og flere år på frost... (Virkeligt dårligt for forretningen :-D)


BEMÆRK! ***Download GÆROVERSIGT herunder i PDF nedenfor*** (Informationer om fortrukken øltype/stil, bundfældelse, Alkoholtolerence etc.)

Attenuation And Flocculation
Brewing terms attenuation and flocculation are defined and explained in this section. The material is derived from articles Chris White wrote for Brew Your Own magazine many years ago.

ATTENUATION:

Yeast is responsible for turning sweet wort into what we call "beer". Yeast consume the sugar in wort, and turn that sugar into CO2, alcohol, and flavor compounds. When yeast finish the fermentation process, they shut down, clump together, and fall to the bottom of the fermentor, or "flocculate". When yeast flocculate, it is easy to see that fermentation is done. But how can the brewer be sure? What if the flocculation is minimal, and yeast and CO2 stay in solution. How does the brewer really know when fermentation is done? The answer: by testing the degree of attenuation. Apparent attenuation percentage is the percentage of sugars that yeast consume. Attenuation varies between different strains. The fermentation conditions and gravity of a particular beer will cause the attenuation to vary, hence each strain of brewers yeast has a characteristic attenuation range. The range for brewers yeast is typically between 65-85%.

How does a brewer calculate attenuation?

First, the specific gravity must be checked with a hydrometer before the yeast is pitched. Specific gravity is a measurement of density. The specific gravity of water is 1.000, and wort has a higher density relative to water because of the sugars present in wort. As these sugars are consumed by yeast during fermentation, the density and therefore specific gravity measurement lowers. The yeast also produce alcohol, which is lighter than water, so to obtain the "actual" attenuation, alcohol must be removed by heat and replaced by water. Only large breweries go to such lengths to report the "actual" attenuation, while the attenuation most homebrewers measure is "apparent" attenuation. The specific gravity measured before pitching, after correcting for temperature, is called the "OG", or Original Gravity. The OG needs to be logged into a brewers notebook. Then during fermentation, the specific gravity can be re-checked. The specific gravity will fall towards 1.000 during fermentation, and a brewer can learn much about the fermentation by checking the specific gravity of the beer daily. Once the gravity remains the same for 3 days in a row, the yeast is most likely done with fermentation. The specific gravity at the end of fermentation is called "FG", or Final Gravity. To calculate attenuation percentage, the following equation can be used:
[(OG-FG)/(OG-1)] x 100

The only way to know if a yeast has completed fermentation is to check the expected attenuation. Many homebrewers make the mistake of worrying about a beer before they even check the attenuation. A simple check of the specific gravity at the end of fermentation will help in this regard. It is not completely accurate without computing the attenuation. For example, if a high gravity beer is made, the FG will be higher then normal, but the expected attenuation for that yeast strain may have been obtained. To obtain expected attenuation numbers, consult a list of yeast strain attenuation figures.

Most manufactures of brewers yeast list the attenuation ranges of their yeast strains. This can be very useful to a brewer in matching a yeast strain to a beer style. An example would be a brewer wishing to make an American-style Pale Ale. A yeast strain should be selected that will produce a dry finish, and allow for hop flavors to come through. A good choice would be a neutral yeast with an attenuation of 70-80%. If a brewer wants to make an English style mild ale, a yeast strain that does
not attenuate as much would be desired. An attenuation range of 65-70% would be more appropriate. Would a yeast strain that attenuates to 80% taste bad in an English style mild ale? No, but the beer would not taste true to style.

FLOCCULATION:

Brewers have created their own unique vocabulary. Words such as pitching, attenuation, and flocculation take on special meaning to brewers. Pitching is adding yeast to wort to start fermentation. Attenuation is the percentage of sugars yeast consume during fermentation. The magical art of yeast coming together, dropping to the bottom of a fermentor, is called flocculation.

Flocculation is a desirable and important characteristic that is unique to brewers yeast. When brewers yeast nears the end of fermentation, single cells aggregate into clumps of thousands of cells, and drop to the bottom of the fermentor, leaving clear beer behind. If yeast flocculate too early, the beer will be underattenuated and sweet. If yeast do not flocculate, the beer will be cloudy and have a yeasty taste.

Most strains of yeast, which brewers call "wild" yeast, do not flocculate well, and remain in suspension for extended periods of time. The ability to flocculate is a product of natural selection. Brewers have continually collected yeast either from the bottom or top of a fermentor and in doing so, selected for increasingly flocculent stains. The chemistry of flocculation is complex, and will be the subject of a future article.

Yeast flocculation can be classified as high, medium, or low. Ale yeast strains are found in each category, while lager yeast are predominantly medium flocculators. An English/London Ale strain would be a high flocculator, while an California/American Ale strain a medium flocculator. A Hefeweizen strain is an example of a low flocculator. It is difficult to tell which category of flocculator is used to produce individual commercial beers, because most commercial beers are filtered before being bottled or kegged.