Holbein Artists' Soft Pastel - Chrome Yellow 1

Pigment Information

This color contains the following pigments:

PY55-Diarylide Yellow Deep

PW6-Titanium White

Pigment Name

PY55-Diarylide Yellow Deep

Pigment Type

organic, disazo

Chemical Formula

C34H30Cl2N6O4

Properties

Diarylide Yellow Deep is a semi-transparent deep yellow pigment with high tinting strength.

Permanence

Diarylide Yellow Deep is less lightfst than other diarylide yellows, often rated fair. Its fightfastness has been rated only 5 on the blue wool scale (5-8).

Toxicity

Diarylide Yellow pigments have no significant acute hazards, but possible chronic hazards have not been well studied.

History

Pigment Name

PW6-Titanium White

Pigment Type

inorganic

Chemical Name

titanium dioxide

Chemical Formula

TiO2

Properties

Titanium White is the most brilliant of the white pigments. It is considered an all purpose oil color useful in all techniques and the best all around white. Its masstone is neither warm nor cool, placing it somewhere between Lead White and Zinc White. It is less prone to cracking and yellowing than Lead White, but it still yellows easily. Titanium White dries slowly in oil form, more slowly than Lead White but more quickly than Zinc White. It is opaque in oil and acrylic forms and semi-opaque in watercolor form. This pigment has good chemical stability, and its tinting strength is superior to both Lead White and Zinc White.

Permanence

Titanium White has excellent permanence and lightfastness.

Toxicity

Titanium dioxide is highly stable and is regarded as completely non-toxic. Animal studies give no indiciation that it is absorbed biologically, even after long periods of exposure. The primary safety concern is with inhalation of fine pigment dust particl

History

Titanium is the ninth most abundant element in the Earth's crust, however mineral deposits that are economical to mine are less common. Titanium dioxide was first discovered in 1821, although it could not be mass produced until 1919. Widespread use of the pigment began in the 1940s. Since that time, it has become the most commonly used white pigment. The name comes from the Latin word Titan, the name for the elder brother of Kronos and ancestor of the Titans, and from the Greek word tito, meaning day or sun.