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Technical Brewing Beyond Lovibond — Understanding Beer Color. Bob Hansen - Technical Services Manager 4.18.08. Color and Light. What is light?. Electromagnetic wave spectrum. []. Retrieved April  13,  2008, from Encyclopædia Britannica Online: http://www.britannica.com/eb/art-70892.

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technical brewing beyond lovibond understanding beer color

Technical BrewingBeyond Lovibond — Understanding Beer Color

Bob Hansen - Technical Services Manager

4.18.08

slide2

Color and Light

What is light?

Electromagnetic wave spectrum.

[]. Retrieved April  13,  2008, from Encyclopædia Britannica Online: http://www.britannica.com/eb/art-70892

slide3

Color and Light

What is color? What causes color?

slide5

Reflection, Absorption and Transmittance

Colored light can come to the eyes in one of three ways:

Primary Source

  • Directly from a light source

Secondary Sources

  • Light reflected off an object
  • Light transmitted though an object

For Secondary Sources, Interaction of Primary Light and Secondary Source is Very Important

slide6

Beer’s color is Transmitted

White light is transformed to yellows as blues are absorbed.

BEER

slide7

Measuring beer color

Many means have been used to measure and predict a beers color:

  • Visually-the original and obvious way
  • Using a machine
  • Using a more expensive machine
slide8

Measuring Transmitted Light

P0

P

Transmittance = P/ P0

slide9

Measuring Transmitted Light

  • Transmittance measures the % age of light reaching the eye. As the photo response in our eye is proportional to the light it receives, transmittance represents most closely light or color intensity.
slide10

Absorbance vs. Transmittance

Absorbance = Log 10 1/T

Absorbance = Log 10 1/(P/P0)

Absorbance = Log 10 (P0/P)

Beers Law A= eBC

slide11

Absorbance vs. Transmittance

Absorbance = Log 10 1/T

slide12

Wort preparation for color

- Measured using a mash with a grain bill of 50 grams/ 450 grams (11.1% )

- Similar concentration to brewers rule of thumb, 1 lb/gallon (10.7%)

- Corresponds to a wort of roughly 8 Plato or 1.032

- Beer / Wort normally diluted to get absorbance below 2.0

- Specialty malts mashed with base malt as needed

summary specialty malt color
Summary-Specialty Malt Color

Caramel Malt Black Malt

10 SRM Orange Tan

20 SRM Red Brown

30 SRM Mahogany Black

slide26

Summary-formulating for color

  • A beers color is caused by the selective transmission of light
  • Light source, path length and concentration are important to measuring and viewing a beers color
  • Current SRM is good for measuring batch to batch variability within the same recipe
  • Current SRM color rating is ineffective for describing the actual color of darker colored beers.
  • Absorption of light by different classes of malt is mostly equivalent across the spectrum of visible light
slide27

Summary-formulating for color

  • At equivalent SRM the color from different malts within the same class will be the same, though flavor may vary.
  • Dark roasted malts absorb more strongly across the spectrum, leading to darker beers and browner tones at equivalent SRM.
  • Full spectrum analysis can give a truer picture of beer color.
  • True perceived beer color could be predicted from recipe.
  • Tools could be developed to be both predictive and descriptive of true beer color.