I've been preparing this blog entry for about 5 years.
In the aforementioned year of yore, I performed a thoroughly unscientific White Test wherein different brands of oil paint were applied to a little panel and allowed to cure so as to observe their aged properties. I was focusing primarily on how much they yellowed. The results led to some concern so I broadened the test to include more brands/kinds of oil paint, and now . . . after two years of drying. . . I give you the results of this expanded White Test (or Off-White Test, as it is known in-house.)
PAINTS TESTED:
Winsor & Newton (Artist Oil Colors)
Titanium White 37 ml
Zinc White 37ml
Flake White #1 37 ml
Foundation White 37 ml
Cremnitz White 37 ml
Transparent White 120 ml
Winsor & Newton (Griffin Alkyd)
Titanium White 37 ml
Mixed White 37 ml
Gamblin (Artist Oil Colors)
Titanium White 37 ml
Radiant White 37 ml
Titanium Zinc White 37 ml
Zinc White 37 ml
Quick Dry White 37 ml
Flake White Replacement 37 ml
Flake White 37 ml
Grumbacher (Artist Oil Colors Pretested)
Titanium White (soft form) 1.25 fl. oz.
Titanium White (original form) 1.25 fl. oz.
Zinc White 37 ml
Flake White 37 ml
Holbein (Extra Fine Artist Oil Colors)
Ceramic White 50 ml
Zinc White 50 ml
Lukas 1862 (Finest Artist Oil Colors)
Opaque White 37 ml
Zinc White 37 ml
Titanium White 37 ml
Old Holland (Classic Oil Colors)
Mixed White #2 (zinc & titanium) 40 ml
Titanium White 40 ml
Cremnitz White 40 ml
Flake White #1 Cremnitz & Zinc 40 ml
Vasari (Classic Artist Oil Color)
Titanium Zinc White 40 ml
Zinc White 40 ml
Titanium White 40 ml
Permalba (Artist Oil Color)
Original White 150 ml
Zinc White 37 ml
Titanium White 37 ml
Iridescent White 37 ml
Chroma (Archival Permanently Flexible Artists Oils)
Titanium White 40 ml
Chroma (Professional Artists Oils)
Tinting White (Pearl/Titanium) 40 ml
C.A.S. Alkyd Pro
White Luster 70 ml
Titanium White 70 ml
Rembrandt (Extra Fine Oil Colors)
Transparent White 40 ml
Flake Whites
Quick Dry Whites
Supposedly White Whites
Titanium Whites 1
Titanium Whites 2
Titanium Zinc Whites
Zinc Whites
Transparent Whites
THE WINNERS (Still White):
• Permalba (Artist Oil Color) - Original White
• Lukas 1862 (Finest Artist Oil Colors) - Titanium White
• Grumbacher (Artist Oil Colors Pretested) - Titanium White (soft form)
PRACTICALLY ORANGE:
• Gamblin (Artist Oil Colors) - Radiant White
• Grumbacher (Artist Oil Colors Pretested) - Flake White
• Permalba (Artist Oil Color) - Zinc White
• Permalba (Artist Oil Color) - Titanium White
LEMONY YELLOW:
• Winsor & Newton (Artist Oil Colors) - Cremnitz White
• Winsor & Newton (Artist Oil Colors) - Transparent White
• Rembrandt (Extra Fine Oil Colors) - Transparent White
VERDICT:
The culprit seems to be the vehicle (or binder) used. Since safflower oil yellows less than linseed oil, I'm sticking with whites made with safflower oil.
(All of these paints are applied to the same gessoed linen panel, so there should be no inconsistency in the ground. We were also careful to wear gloves when touching the surface, so that there would be no inadvertent addition of oil from fingers to confuse the results. No animals were harmed through the testing of these paints - including rabbits. Obviously overly optimistic, I left plenty of space for additional paints to be added eventually - feel free to submit any requests.)