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Questions and Answers
______ dyes are derived from sources like vegetable matter, minerals, or insects.
______ dyes are derived from sources like vegetable matter, minerals, or insects.
Natural
______ is the first synthetic dye made from coal tar.
______ is the first synthetic dye made from coal tar.
Mauveine
______ dye is extracted from lac and creates a resinous protective secretion from a tiny insect.
______ dye is extracted from lac and creates a resinous protective secretion from a tiny insect.
Red Lac
______ dyes are best suited for substrates like nylon, wool, silk, and leather.
______ dyes are best suited for substrates like nylon, wool, silk, and leather.
In the dyeing process, acid dyes, which carry a negative charge, are used with polyamides and proteins that carry a ______ charge.
In the dyeing process, acid dyes, which carry a negative charge, are used with polyamides and proteins that carry a ______ charge.
______ dyes are typically applied under acidic conditions to ensure proper bonding with fabrics.
______ dyes are typically applied under acidic conditions to ensure proper bonding with fabrics.
Although acid dyes are inexpensive and lightfast, they are not ______ fast.
Although acid dyes are inexpensive and lightfast, they are not ______ fast.
______ dyes are best suited for substrates like polyacrylics and carry a positive charge.
______ dyes are best suited for substrates like polyacrylics and carry a positive charge.
Basic dyes derive their name from the fact that they possess a ______ group, which gives them their dyeing properties.
Basic dyes derive their name from the fact that they possess a ______ group, which gives them their dyeing properties.
In contrast to acid dyes, ______ dyes are known for their good fastness and bright shades when applied to fabrics.
In contrast to acid dyes, ______ dyes are known for their good fastness and bright shades when applied to fabrics.
Flashcards
Natural Dyes
Natural Dyes
Dyes obtained from natural sources such as vegetable matter, minerals, or insects.
Mauveine
Mauveine
First synthetic dye made from coal tar.
Indigo
Indigo
Brilliant blue color made from fermented leaves of a plant.
Acid Dyes
Acid Dyes
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Suitable substrates for Acid Dyes
Suitable substrates for Acid Dyes
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Basic Dyes
Basic Dyes
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Origin of Basic dyes name
Origin of Basic dyes name
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Suitable substrates for Basic Dyes
Suitable substrates for Basic Dyes
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Property of Basic Dyes
Property of Basic Dyes
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Red Lac Dye
Red Lac Dye
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Study Notes
- Dyes are either of natural origin or synthetically manufactured.
Natural Dyes
- Natural dyes come from sources like vegetable matter, minerals, and insects.
- They can also be manufactured from petrochemical feedstock.
- Examples:
- Mauveine: the first synthetic dye, made from coal tar.
- Indigo: a brilliant blue color from fermented plant leaves.
- Red Lac dye: extracted from lac, a resinous secretion from a tiny insect.
- Iron oxide: gives a brown color.
- Buff: derived from ferrous sulfate.
Synthetic Dyes
- Acid Dyes (Anionic Dyes)
- Suitable substrates include polyamides like nylon and proteins like wool, silk, and leather.
- Acid dyes have a negative charge (anionic) and are used on polyamides and proteins with a positive charge (cationic) during dyeing.
- Applied in acidic conditions.
- These dyes have good lightfastness but are not very resistant to wet conditions.
- Example: Acid Black 1
- Basic Dyes (Cationic Dyes)
- Suitable substrates are polyacrylics.
- Basic dyes carry a positive charge (cationic) and are used on polyacrylics with a negative charge (anionic) during dyeing.
- They are named for the cationic group they possess.
- They exhibit good fastness and bright shades.
- Examples: Mauveine (first synthetic dye), Basic Red 18
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