Tri-Art Art Noise Permanent Acrylic Gouache - Brilliant Purple, 120 ml, Bottle

Pigment Information

This color contains the following pigments:

PW6-Titanium White

PR57-Lithol Rubine

PV3-Methyl Violet 2B

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.

Pigment Name

PR57-Lithol Rubine

Pigment Type

organic, monoazo

Chemical Formula

C18H12N2O6, sodium salt

Properties

Lithol Rubine is a deep transparent red dye, generally slightly bluish, that is laked as a salt with sodium or calcium to form a pigment.  PR57 is the sodium salt, and has a more bluish tone. PR57:1 is the calcium salt, and is the most widely used. Lithol Rubine makes clean pinks when tinted. Sources vary greatly in hue and transparency. Lithol Rubine has high tinting strength.

Permanence

Lightfastness is considered only fair to good. Superior products are available when lightfastness is paramount. Where greater lightfastness is needed in process color printing, the more expensive pigment PR184, a Naphthol AS pigment,  is often substituted for Lithol Rubine.

Toxicity

Lithol Rubine is not considered toxic. It is used in food, drugs, and cosmetics, such as lipstick. It can be used in art materials intended for children.

History

Lithol Rubine pigments (especially the calcium salt PR57:1) are widely used in inks, paints, plastics, and textiles. Lithol Rubine is widely used as magenta in process color printing.

Pigment Name

PV3-Methyl Violet 2B

Pigment Type

organic, triarylcarbonium

Chemical Name

tetramethyl violet

Chemical Formula

C24H28N3Cl

Properties

Methyl Violet 2B is a staining, transparent violet dye. It turns yellow when exposed to strong acids.

Permanence

Methyl Violet 2B will fade with exposure to ultraviolet light.

Toxicity

Methyl Violet 2B is harmful to living cells and organisms, so it is diluted in medical and biological applications as a topical fungicide or disinfectant. Methyl Violet 2B may cause irritation to the skin, eyes, respiratory tract, or gastrointestinal trac

History

Methyl Violet dyes are used in medical, biological, and pharmaceutical applications. Common Methyl Violets include Methyl Violet 2B, Methyl Violet 6B, and Methyl Violet 10B. They are often used as biological stains for cytology. The common name Gentian Violet is sometimes applied to this class of dyes. In very dilute form, Gentian Violet is often used as an antifungal agent, including in applications where there is contact with skin and other tissue. Paper impregnanted with Methyl Violet 2B is used to test pH because it turns yellow at pH 0.