Question
Which of the following is a soluble blueing agent ?
The correct answer is
Methylene blue
Soluble Blueing Agent Identification
A blueing agent is used to impart a blue color. The key requirement here is solubility, meaning the agent must dissolve in a solvent, typically water.
Analysis of Blueing Agent Options
Let's examine the solubility of each option:
- Ultramarine: This is a deep blue pigment, generally considered insoluble in water and common solvents.
- Indigo: While a well-known blue dye, natural indigo has low water solubility. Soluble forms exist (like Indigo Carmine), but indigo itself isn't typically described as readily soluble.
- Methylene blue: This is a cationic dye that is highly soluble in water, appearing as a deep blue solution. It is widely used as a stain and indicator precisely because of its solubility.
- Prussian blue: This is another common blue pigment, known for being insoluble in water.
Based on the solubility requirement, Methylene blue is the correct choice.
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