China Suppliers Factory for Victoria Pure Blue BO | C.I. Basic Blue 7 Triarylmethane Dye
Product Introduction
Basic Blue 7 is an organic compound mainly used as a blue dye. It belongs to the triarylmethane dye class and is also known as Basic Brilliant Blue BO or Victoria Pure Blue BO.
Physical & Chemical Properties
1. Appearance
Brown or reddish lustrous blue powder
2. Solubility
- Slightly soluble in cold water, freely soluble in hot water to form bright blue solution
- Highly soluble in ethanol and methanol, yielding blue alcoholic solution
- Insoluble in hydrocarbon solvents
3. Color Change Reactions
- Concentrated sulfuric acid: Tan solution; turns reddish yellow upon dilution with water
- Sodium hydroxide: Red-brown precipitate forms when added to aqueous dye solution
4 & 5. Spectral & Thermal Data
- Spectral Property: Maximum absorption wavelength λmax = 619 nm
- Boiling Point: 612.2 °C (760 mmHg)
- Flash Point: 324 °C
6. Stability & Storage
Hygroscopic powder; store hermetically at ambient temperature.
Frequently Asked Questions (FAQ)
Q What is Basic Blue 7 and what is its classification?
Basic Blue 7 is an organic compound mainly used as a blue dye. It belongs to the triarylmethane dye class and is also commonly known as Basic Brilliant Blue BO or Victoria Pure Blue BO.
Q What does Basic Blue 7 look like?
It typically appears in the form of a brown or reddish lustrous blue powder.
Q What are the solubility characteristics of Basic Blue 7?
It is slightly soluble in cold water and freely soluble in hot water, producing a bright blue solution. It is also highly soluble in ethanol and methanol, but insoluble in hydrocarbon solvents.
Q How does Basic Blue 7 react to sulfuric acid and sodium hydroxide?
When dissolved in concentrated sulfuric acid, it forms a tan solution that turns reddish yellow upon dilution with water. When sodium hydroxide is added to its aqueous dye solution, a red-brown precipitate forms.
Q What are the key thermal and spectral values for Basic Blue 7?
Basic Blue 7 has a maximum absorption wavelength (λmax) of 619 nm, a boiling point of 612.2 °C (at 760 mmHg), and a flash point of 324 °C.
Q How should Basic Blue 7 be stored?
Because it is a hygroscopic powder, it must be stored hermetically (in an airtight seal) at ambient temperature to maintain stability.