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Questions and Answers
What is the aim of Direct Dyes Experiment No. 1?
What is the aim of Direct Dyes Experiment No. 1?
- To see the effect of MLR in the application of direct dyes.
- To dye cotton fabric with best combination of MLR, electrolyte and dye and compare the effect of different after treatments given to the dyed fabric. (correct)
- To see the effect of concentration of dye.
- To see the effect of concentration of salt/electrolyte.
Which dye was the first direct dye discovered by Bottiger?
Which dye was the first direct dye discovered by Bottiger?
- Alizarin
- Congo Red (correct)
- Sulphonated Azo
- Indigo
What distinguishes direct dyes from basic and acid dyes?
What distinguishes direct dyes from basic and acid dyes?
- Cellulosic fibers have a strong affinity for them. (correct)
- They are less expensive.
- They have better wet-fastness properties.
- They are sulphonated azo compounds.
What was the impact of the discovery of direct dyes on cotton dyeing?
What was the impact of the discovery of direct dyes on cotton dyeing?
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Why was the assumption made that the binding forces between direct dyes and cellulose were purely physical?
Why was the assumption made that the binding forces between direct dyes and cellulose were purely physical?
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