Natural Dyes

IIT Kanpur Course , Prof. Padma Vanker

Lecture 1:

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Lecture Details :

Natural Dyes by Dr.Padma Vanker, Department of Textile Engineering, IIT Kanpur. For more details on NPTEL visit

Course Description :

History of Dyestuff - Light colour and different dyestuffs - Classification of Natural dyes By structure and by color - Relation between Color and constitution - Toxicity of dyestuffs - Synthetic Dyestuff vs Natural dyestuff - Commercial dyes - Oxidation of Colors - Direct cotton dyes and role of electrolytes - Fundamentals of Evaluation of dyestuff by analytical techniques - Use of chromatography in dyestuff chemistry - Use of Spectroscopy in dyestuff chemistry - Non textiles dyestuffs- Synthetic and natural - Medicinal properties of Natural dyes - Technology of dyeing

Basics of Natural Dyeing - Methods of Extraction of natural dyes - Standardization of Natural dyes - Vat dyes and dyeing - Pretreatments used in Dyeing - Dyeing machinery - Continuous dyeing and its adaptation for natural dyeing - Dyeing application of each dye on Cotton, Silk and Wool with fastness properties, CIELab values and shade card - Assessment of Ecofriendliness of Naturally dyed fabrics - Description of the Newer Natural Dye sources- Anthroquinoids dyes

Description of the Newer Natural Dye sources- Indigoid dyes - Description of the Newer Natural Dye sources-Anthocyanin dyes - Description of the Newer Natural Dye sources- Betalains - Isolation, and characterization of the colorant molecules from each dye plant - Structure- mordant interactions - Dyeing applications with Reactive Dyes - Dyeing applications with Sulphur dyes - Dyeing applications of Polyester and its blends - Dyeing applications with polyamides - Dyeing applications with Acrylics

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