Color Swatch created using heavy to light application and was applied on 100 lb (163 gsm) drawing paper material.
This color contains the following pigments:
PR81:1—Rhodamine 6G
Pigment Type
organic, fluorone dye
Chemical Name
n/a
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.
Alternate Names
Pigment BR1:1.
PV1—Rhodamine B
Pigment Type
organic, fluorone dye
Chemical Name
Rhodamine B
Chemical Formula
C28H31N2O3Cl
Properties
Rhodamine B is a staining violet dye that has flourescent properties. It is extremely soluble in both water and alcohol. In art materials, it is laked as a pigment.
Permanence
Rhodamine B, like all fluorescent dyes, is not considered to be lightfast. It is recommended for permanent works of art only if they can be adequately protected from exposure to ultraviolet light.
Toxicity
The fluorescent dye Rhodamine B is toxic, and its use is banned in food, textiles, and cosmetics. It is harmful if swallowed, inhaled, or absorbed through the skin. It has been shown to be carcinogenic in rats when injected subcutaneously, producing local sarcomas. However, when it is laked as a pigment it can be biologically inactive and hence non-toxic. With proper preparation, the pigment Rhodamine B Lake is considered harmless, even if ingested.
History
Rhodamine B, discovered in 1887, is used as a staining fluorescent dye in the biological sciences, for microscopy. It is also used as a laser dye. Because of its low cost, high tinting strength, solubility in water and alcohol, and relative stability for a fluorescent, it has sometimes been used as a food colorant, even though its use in food and cosmetics has been banned in most countries for many years. There have been several highly publicized recalls of food and cosmetic products contaminated with Rhodamine B.
Alternate Names
Basic Violet 10, C.I. 45170, Rhodamine 610
