The Effect of Light and Dye Composition on the Color of Dyeings with

Indigo 6-Bromoindigo

6,6'-DibromoindigoComponents of Tyrian

PurpleAygul Islamova, John Scalise, Derrick Claye, Ioannis Karapanagiotis, Christopher

Cooksey, Sasan Karimi and Keith Ramig

Department of Natural Sciences Baruch College of the City University of New York

Presented By: Aygul Islamova, John ScaliseMay 9th, 2015

N

N

O

OH

H

N

N

O

OH

H

N

N

O

OH

H

Br Br

Br

6-Bromoindigo(MBI)

6,6'-Dibromoindigo(DBI)

Indigo

Source: O. Lavinda et al./ Dyes and Pigments 96 (2013) 581-589

“Leuco” Formation

Source: O. Lavinda et al./ Dyes and Pigments 96 (2013) 581-589

Leuco: standard condition

Colorimetry CIELAB Color Space

• Lightness: L* _L*  

• Hue: a* -(a*) b* -(b*)

• Color Difference:

Euclidean Distance ΔEab*

http://pengantar-warna.blogspot.com/2011_03_01_archive.html

-5

0

5

10

15

20

25

30

35

a*

a*

a*

-(b*)

-(b*)

-(b*)

Hue Comparisons for 1st passes of Wool dyeing with Indigoids

a*,

-(b

*)

IND MBI DBI

Standardizing Dyeing Conditions

MBI wool

pass avg s.d. s.d. %

L* 34.2 2.8 8

1st a* 21.4 0.9 4

b* 25.4 0.2 1

  L* 41.4 0.4 1

2nd a* 17.5 1 6

  b* 27.2 0.3 1

A B C0

5

10

15

20

25

30

a*

a*

a*

-(b*)

-(b*)

-(b*)

Effect of Light on Color MBI dyed Wool

Dyeing Conditions

a*,

-(b

*)

STD INCFLU

ΔEab* for Standard vs. FLU, INC

FLU ΔE 10.4 INC ΔE 21.6

Future Research Goals• HPLC analysis in studying debromination

• Mixture indigoid dyeings: equimolar IND:MBI, MBI:DBI

• Study whether there is a difference in affinity for the fabric between indigoids

• To determine the ratio of indigoids in the dyeing vat VS. on the fabric using CIELAB data and HPLC analysis

Equimolar Indigoid Mixture Dyeing

DBI DBI:MBI MBI MBI:IND IND

1st Pass

2nd Pass

Acknowledgements

• Mentor: Dr. Keith Ramig

• Collaborators:

o Baruch College: Derrick Claye

o Queensborough Community College: Sasan Karimi

o University Ecclesiastical Academy of Thessaloniki,

Thessaloniki Greece: Ioannis Karapanagiotis

o Watford, Hertfordshire England: Christopher Cooksey

Thank You

Thank You Sonia

Department of Natural Sciences Baruch

Dr. RamigDr. Gernert

BIOMED

Dr. Greer

Niel

Dr. Kulatilleke

Dr. Barbour

Dr. Bourkoff

Dr. Wahlert

Dr. Schawaroch

Dr. Szalda

Dr. Butler

Dr. Catto

All Faculty