Ultramarine Blue R6 French Ultramarine 1 oz Dry by Volume

Extinct Pigment Blue (Red shade) | Class=Inorganic | Dry Pigment | Color Index: PB29

Pigment Class: Inorganic
Color Index Number: PB29
Opacity: M-L
Tinting Strength: 2
Alkali Resistance: 5
Blue Wool Scale (Lightfastness): F: 8 M:8 L:8
Weatherfastness: F:No M:No L:No

Key:
Opacity: H=High, M=Medium, L=Low, T=Transparent, VT=Very Transparent
Tinting Strength: 1=Poor, 2=Fair, 3=Good, 4=Very Good, 5=Excellent
Alkali Resistance: 1=Poor, 2=Fair, 3=Good, 4=Very Good, 5=Excellent (Alkali Resistant does not mean “lime safe”)
Blue Wool Scale (Industrial system to measure lightfastness): F=Full Tone, M=Medium Tone, L=Light Tone. 1=Poor, 2=Fair, 3=Good, 4=Very Good, 5=Excellent
Weatherfastness: F=Full Tone, M=Medium Tone, L=Light Tone. “No” indicates pigments the should not be used outdoors.

R6 stands for 6 degrees towards red. This is the original French Ultramarine from the turn of the century, made by Reckitts in England. Reckitts was the first company to manufacture Ultramarine Blue.