Introduction

Some manufacturer includes color notations in their charts or technical documentation. That color notation defines the color much more accurately than a color name.

Two systems used most frequently to describe colors are Munsell notation, and CIE L*a*b. You can read about those on Handprint or check the links on the Colour Online by David Briggs.

Whenever those notations from the manufacturers are available, I display them on the page. When only Munsell notation is provided (in most of the cases) I display only an interpolated CIE L*a*b* value. To calculate, I use the munsellinterpol R package. Here's an example:

Medium Attributes, Swatch Code Name Pigments
Pc
#<Company:0x00007ffb957a4688> Poster Colour 013 Heliotrope PW6, PV3 painted swatch#<Company:0x00007ffb957a4688> Poster Colour 013 Heliotrope PW6, PV3 mixed with white painted swatch#<Company:0x00007ffb957a4688> Poster Colour 013 Heliotrope PW6, PV3 mixed with black painted swatch
★☆
013
Nicker Poster Colour (poster_color)
Heliotrope
Munsell: 0.5P 5.5/10.5
CIE Lab: L*55.89 a*23.02 b*-37.7
 
 PW6  PV3

Under the CIE L*a*b* value I also display the calculated color value in sRGB (along with the fact if it's out of gamut). For this calculation, I use the algorithm, based on the information on EasyRGB. (D65 10° daylight). Here's an example of an out of gamut conversion. In this case, most likely the scanned image is also off.

Medium Attributes, Swatch Code Name Pigments
G
#<Company:0x00007ffb958a9470> Artists' Gouache G571 Pure Blue PB15 painted swatch#<Company:0x00007ffb958a9470> Artists' Gouache G571 Pure Blue PB15 mixed with white painted swatch#<Company:0x00007ffb958a9470> Artists' Gouache G571 Pure Blue PB15 mixed with black painted swatch
★★☆☆
G571
Holbein Artists' Gouache (gouache)
Pure Blue
ピュア ブルー (jp)
Munsell: 3.5PB 4.0/11.5
CIE Lab: L*40.59 a*-0.4 b*-46.66
 
 PB15

Brands with Munsell and interpolated CIE L*a*b* information

Daler Rowney Cryla Acrylic CIE L*a*b* a*b* plane
Golden Williamsburg Oil CIE L*a*b* a*b* plane
Holbein Acryla Gouache Acrylic gouache CIE L*a*b* a*b* plane
Holbein Acrylic Ink Ink acrylic CIE L*a*b* a*b* plane
Holbein Artists' Gouache Gouache CIE L*a*b* a*b* plane
Holbein Artists' Oil Color (HOC) Oil CIE L*a*b* a*b* plane
Nicker Acrylic Gouache Acrylic gouache CIE L*a*b* a*b* plane
Nicker Designers Colour Gouache CIE L*a*b* a*b* plane
Nicker Poster Colour Poster color CIE L*a*b* a*b* plane
Turner Acryl Gouache Acrylic gouache CIE L*a*b* a*b* plane
Turner Design Gouache Gouache CIE L*a*b* a*b* plane
Turner Poster Colour Poster color CIE L*a*b* a*b* plane
Turner U-35 Acrylic CIE L*a*b* a*b* plane

Brands with CIE L*a*b* information

Daler Rowney Cryla Acrylic CIE L*a*b* a*b* plane
Golden Fluid Acrylic CIE L*a*b* a*b* plane
Golden Heavy Body Acrylic CIE L*a*b* a*b* plane
Golden OPEN Acrylic CIE L*a*b* a*b* plane
Golden SoFlat Acrylic CIE L*a*b* a*b* plane
Golden Williamsburg Oil CIE L*a*b* a*b* plane
Holbein Acryla Gouache Acrylic gouache CIE L*a*b* a*b* plane
Holbein Acrylic Ink Ink acrylic CIE L*a*b* a*b* plane
Holbein Artists' Gouache Gouache CIE L*a*b* a*b* plane
Holbein Artists' Oil Color (HOC) Oil CIE L*a*b* a*b* plane
Nicker Acrylic Gouache Acrylic gouache CIE L*a*b* a*b* plane
Nicker Designers Colour Gouache CIE L*a*b* a*b* plane
Nicker Poster Colour Poster color CIE L*a*b* a*b* plane
Schmincke Designers' Gouache (HKS) [Series 25] Gouache CIE L*a*b* a*b* plane
Schmincke HORADAM Aquarell [Series 14] Watercolor CIE L*a*b* a*b* plane
Turner Acryl Gouache Acrylic gouache CIE L*a*b* a*b* plane
Turner Design Gouache Gouache CIE L*a*b* a*b* plane
Turner Poster Colour Poster color CIE L*a*b* a*b* plane
Turner U-35 Acrylic CIE L*a*b* a*b* plane

Other sources

There are other sources for CIE L*a*b* values, based on 3rd party measurements. For example for different Schmincke brands, you can check the freieFarbe Color Database.

You can also check the CIALAB ab plane with pigments on Handprint.