Difference between revisions of "Eosin"

Latest revision as of 07:30, 2 August 2022

Chinese drawing
MFA# 2018.450

Description

Eosin

A red crystalline dye composed of the Potassium, Sodium, or Lead salt of tetrabromofluorescein. First discovered by Caro in 1871, eosin is primarily used as an acid dye for producing a blood red color in Silk, Wool, Paper, Leather, and Cotton. It is also used as a histological stain, a cosmetic colorant, and a colorant in red inks. In the late 19th and early 20th century, eosin was also used as a red paint pigment. Alcoholic solutions have a strong green Autofluorescence. Eosin is not permanent and fades rapidly in sunlight.

Absorption spectrum

Synonyms and Related Terms

tetrabromofluorescein; Pigment Red 90; CI 45380; D&C Red No. 22; D&C Red No. 21; Acid Red 87; Solvent Red 43; éosine (Fr.); eosina (Esp., Port.); eosin Y; eosine A; eosine G; bromeosin; bromofluoresceic acid; geranium lake; eosine yellowish

Risks

Causes skin irritation.
Fades rapidly in sunlight.
Delasco: SDS

Physical and Chemical Properties

Soluble in ethanol. Insoluble in water (potassium and sodium salts of eosin are water soluble).
Maximum absorption wavelength = 520 nm.
Maximum emission wavelength = 540 nm.

Composition	C20H8O5Br4
CAS	548-26-5
Melting Point	300 C
Molecular Weight	Mol. wt. = 647.9

Resources and Citations

M.Ballard (ed.), Important Early Synthetic Dyes. Chemistry, Constitution, Date, Properties. Conservation Analytical Laboratory, Smithsonian Institution, 1991.

R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966

Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

Monona Rossol, The Artist's Complete Health and Safety Guide, Allworth Press, New York, 1994

The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 3639

Encyclopedia Britannica, http://www.britannica.com Comment: "Chemical Compound."(Accessed 12 May 2004).

Website: www.probes.com/handbook/sections - gives absorption max=524 and emission max=544

Website: member.pgonline.com/~bryand/dyes/45380.htm - absorption max = 516

Colour Index International online at www.colour-index.org Comment: discoverer and date

Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C20H8O5Br4, CAS= 548-26-5

The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

@@ Line 1: / Line 1: @@
+[[File:MFA2018450 Eosin.jpg|thumb|Chinese drawing<br>MFA# 2018.450]]
+== Description ==
 [[File:Eosin.jpg|thumb|Eosin]]
-== Description ==
+A red crystalline dye composed of the [[potassium]], [[sodium]], or [[lead]] salt of tetrabromofluorescein. First discovered by Caro in 1871, eosin is primarily used as an acid dye for producing a blood red color in [[silk]], [[wool]], [[paper]], [[leather]], and [[cotton]]. It is also used as a histological stain, a cosmetic colorant, and a colorant in red inks. In the late 19th and early 20th century, eosin was also used as a red paint pigment. Alcoholic solutions have a strong green [[autofluorescence]]. Eosin is not permanent and fades rapidly in sunlight.
-A red crystalline dye composed of the [http://cameo.mfa.org/materials/fullrecord.asp?name=potassium potassium], [http://cameo.mfa.org/materials/fullrecord.asp?name=sodium sodium], or [http://cameo.mfa.org/materials/fullrecord.asp?name=lead lead] salt of tetrabromofluorescein. First discovered by Caro in 1871, eosin is primarily used as an acid dye for producing a blood red color in [http://cameo.mfa.org/materials/fullrecord.asp?name=silk silk], [http://cameo.mfa.org/materials/fullrecord.asp?name=wool wool], [http://cameo.mfa.org/materials/fullrecord.asp?name=paper paper], [http://cameo.mfa.org/materials/fullrecord.asp?name=leather leather], and [http://cameo.mfa.org/materials/fullrecord.asp?name=cotton cotton]. It is also used as a histological stain, a cosmetic colorant, and a colorant in red inks. In the late 19th and early 20th century, eosin was also used as a red paint pigment. Alcoholic solutions have a strong green [http://cameo.mfa.org/materials/fullrecord.asp?name=autofluorescence autofluorescence]. Eosin is not permanent and fades rapidly in sunlight.
+[[File:Eosin_abs.jpg|thumb|Absorption spectrum]]
-[[File:Eosin_abs.jpg|thumb|Absorption spectrum]]
 == Synonyms and Related Terms ==
-tetrabromofluorescein; Pigment Red 90; CI 45380; D&C Red No. 22; D&C Red No. 21; Acid Red 87; Solvent Red 43; osine (Fr.); eosina (Esp., Port.); eosin Y; eosine A; eosine G; bromeosin; bromofluoresceic acid; geranium lake; eosine yellowish
+tetrabromofluorescein; Pigment Red 90; CI 45380; D&C Red No. 22; D&C Red No. 21; Acid Red 87; Solvent Red 43; éosine (Fr.); eosina (Esp., Port.); eosin Y; eosine A; eosine G; bromeosin; bromofluoresceic acid; geranium lake; eosine yellowish
+== Risks ==
-== Other Properties ==
+* Causes skin irritation.
+* Fades rapidly in sunlight.
+* Delasco: [https://www.delasco.com/content/sds/EOSIN-SDS.pdf SDS]
-Soluble in ethanol.  Insoluble in water (potassium and sodium salts of eosin are water soluble).
+== Physical and Chemical Properties ==
-Maximum absorption wavelength = 520 nm.
+* Soluble in ethanol.  Insoluble in water (potassium and sodium salts of eosin are water soluble).
+* Maximum absorption wavelength = 520 nm.
-Maximum emission wavelength = 540 nm.
+* Maximum emission wavelength = 540 nm.
 {| class="wikitable"
@@ Line 26: / Line 30: @@
 |-
 ! scope="row"| Melting Point
-| 300
+| 300 C
 |-
 ! scope="row"| Molecular Weight
@@ Line 32: / Line 36: @@
 |}
-== Hazards and Safety ==
+== Resources and Citations ==
-Causes skin irritation. Fades rapidly in sunlight.
-Mallinckrodt Baker: [http://www.jtbaker.com/msds/englishhtml/e0800.htm MSDS]
-== Additional Information ==
-M.Ballard (ed.), ''Important Early Synthetic Dyes. Chemistry, Constitution, Date, Properties.'' Conservation Analytical Laboratory, Smithsonian Institution, 1991.
-== Authority ==
+* M.Ballard (ed.), ''Important Early Synthetic Dyes. Chemistry, Constitution, Date, Properties.'' Conservation Analytical Laboratory, Smithsonian Institution, 1991.
-* R. J. Gettens, G.L. Stout, R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966
+* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966
-* Richard S. Lewis, Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
+* Richard S. Lewis, ''Hawley's Condensed Chemical Dictionary'', Van Nostrand Reinhold, New York, 10th ed., 1993
-* Monona Rossol, Monona Rossol, ''The Artist's Complete Health and Safety Guide'', Allworth Press, New York, 1994
+* Monona Rossol, ''The Artist's Complete Health and Safety Guide'', Allworth Press, New York, 1994
 * ''The Merck Index'', Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983  Comment: entry 3639
-* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "Chemical Compound." Encyclopdia Britannica. 2004.  Encyclopdia Britannica Premium Service.  12 May 2004  .
+* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "Chemical Compound."(Accessed 12 May 2004).
-* Website address 1, Website address 1  Comment: www.probes.com/handbook/sections - gives absorption max=524 and emission max=544
+* Website: www.probes.com/handbook/sections - gives absorption max=524 and emission max=544
-* Website address 2  Comment: member.pgonline.com/~bryand/dyes/45380.htm - absorption max = 516
+* Website: member.pgonline.com/~bryand/dyes/45380.htm - absorption max = 516
 * Colour Index International online at www.colour-index.org   Comment: discoverer and date