brew.utilities.color

color.srm_to_ebc(srm)

Convert SRM to EBC Color

Parameters:srm (float) – SRM Color
Returns:EBC Color
Return type:float
color.ebc_to_srm(ebc)

Convert EBC to SRM Color

Parameters:ebc (float) – EBC Color
Returns:SRM Color
Return type:float
color.calculate_mcu(grain_weight, beer_color, final_volume, units=u'imperial')

Calculate MCU from Grain

Parameters:
  • grain_weight (float) – Grain weight in lbs or kg
  • beer_color (float) – Beer color in deg Lovibond
  • final_volume (float) – Final Volume in gal or liters
  • units (str) – The units

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color.calculate_srm_mosher(mcu)

Mosher Equation for SRM

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the MCU is < 7.0
color.calculate_srm_daniels(mcu)

Daniels Equation for SRM

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the MCU is < 11.0
color.calculate_srm_daniels_power(mcu)

Daniels Power Equation for SRM based on work by Druey

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the SRM is > 50.0
color.calculate_srm_noonan_power(mcu)

Noonan Power Equation for SRM based on work by Druey

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the SRM is > 50.0
color.calculate_srm_morey_hybrid(mcu)

A hybrid approach used by Morey for SRM.

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the MCU is > 50.0

Assumptions:

  1. SRM is approximately equal to MCU for values from 0 to 10.
  2. Homebrew is generally darker than commercial beer.
  3. Base on the previous qualitative postulate, I assumed that Ray Daniels’ predicted relationship exists for beers with color greater than 10.
  4. Since Mosher’s equation predicts darker color than Daniels’ model for values of MCU greater than 37, I assumed that Mosher’s approximation governed beer color for all values more than 37 MCUs.
  5. Difference in color for beers greater than 40 SRM are essentially impossible to detect visually; therefore, I limited the analysis to SRM of 50 and less.

Source:

color.calculate_srm_morey(mcu)

Morey Equation for SRM

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the SRM is > 50.0

Source:

color.calculate_srm(mcu)

General SRM calculation uses the Morey Power Equation

Parameters:mcu (float) – The Malt Color Units
Returns:SRM Color
Return type:float
Raises:ColorException – If the SRM is > 50.0
color.lovibond_to_srm(lovibond)

Convert deg Lovibond to SRM

Parameters:lovibond (float) – The degrees Lovibond
Returns:SRM Color
Return type:float

Source:

color.srm_to_lovibond(srm)

Convert SRM to deg Lovibond

Parameters:srm (float) – SRM Color
Returns:The degrees Lovibond
Return type:float

Source:

color.srm_to_a430(srm, dilution=1.0)

Get attenuation at A430 from SRM and dilution

Parameters:
  • srm (float) – SRM Color
  • dilution (float) – The dilution factor (D=1 for undiluted, D=2 for 1:1 dilution, etc)
Returns:

The attenuiation at 430nm
Return type:

float

Source:

color.ebc_to_a430(ebc, dilution=1.0)

Get attenuation at A430 from EBC and dilution

Parameters:
  • ebc (float) – EBC Color
  • dilution (float) – The dilution factor (D=1 for undiluted, D=2 for 1:1 dilution, etc)
Returns:

The attenuiation at 430nm
Return type:

float

Source: