Pebeo Studio Gouache - Primary Magenta, 100 ml Tube

Pigment Information

This color contains the following pigments:

BR1-Rhodamine 6G

PR57:1-Lithol Rubine

BV11:1-Fluorescent Blue-Violet BV11:1

Pigment Name

BR1-Rhodamine 6G

Pigment Type

organic, fluorone dye

Chemical Formula

C28H31N2O3Cl

Properties

Rhodamine 6G is a staining reddish-yellow pigment that has fluorescent properties. It is extremely soluble in both water and alcohol. Fluorescent molecules absorb light at one wavelength and emit light at a longer wavelength.

Permanence

Rhodamine 6G, like all fluorescent dyes, is not considered permanent, however it is reported  to have high stability for a fluorone dye.

Toxicity

Rhodamine 6G is toxic, however it can be biologically inactive and hence non-toxic in a lake pigment form.

History

Rhodamine dyes are often used for microscopy in the biological sciences. Rhodamine 6G is often used as a laser dye.

Pigment Name

PR57:1-Lithol Rubine

Pigment Type

organic, monoazo

Chemical Formula

C18H12N2O6, calcium salt

Properties

Lithol Rubine (PR57:1) 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. Pink lipstick is often manufactured with pigment PR57:1. Lithol Rubine 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

BV11:1-Fluorescent Blue-Violet BV11:1

Pigment Type

organic

Chemical Formula

Properties

Fluorescent pigments such as BV11:1 offer intense and brilliant effects because they absorb ultraviolet light and re-emit light at longer wavelengths.

Permanence

Like all fluorescent pigments, BV11:1 is not considered permanent. It will fade with exposure to ultraviolet light.

Toxicity

History