Acid Blue 9 (CAS 2650-18-2), also known as Brilliant Blue FCF, is a synthetic organic dye that has carved out a significant niche in various industries due to its vibrant color and chemical properties. As a key player in the chemical market, understanding the nuances of this dye – from its molecular structure to its safety profile and procurement strategies – is essential for any professional involved in product formulation and manufacturing.

The chemical identity of Acid Blue 9 is rooted in its triarylmethane structure, giving it a distinct molecular formula (C37H34N2Na2O9S3) and a molecular weight of approximately 792.85 g/mol. Its physical appearance is typically described as a red-purple to blue-purple powder or granule. The 'acid' in its name refers to its anionic nature, meaning it carries a negative charge and is often used in dyeing processes where it binds to positively charged fibers, such as wool, silk, and nylon. However, its applications extend far beyond textiles.

A crucial aspect for any buyer is the safety and regulatory status of Acid Blue 9. It is widely approved by major regulatory bodies, including the US FDA and the European Food Safety Authority (EFSA), for use in food, pharmaceuticals, and cosmetics. For food applications, it is classified as FD&C Blue No. 1. While generally recognized as safe (GRAS) within specified limits, ongoing research and public discourse sometimes raise questions about potential sensitivities or long-term effects, especially concerning consumption by children. This underscores the importance of sourcing from reputable suppliers who adhere to strict quality controls and provide transparent documentation. If you need to buy this dye for sensitive applications, look for manufacturers who can guarantee compliance with the highest safety standards and provide detailed product specifications.

Procurement of Acid Blue 9 involves selecting the right grade and quantity from reliable sources. As a globally recognized chemical, it is manufactured by numerous companies. When seeking to purchase Acid Blue 9, it's vital to partner with a manufacturer or supplier that can offer not only competitive pricing but also consistent quality and reliable delivery. Factors to consider include the assay purity (often specified as ≥85%), the absence of harmful contaminants like heavy metals, and the physical form (powder vs. granule). Engaging with a chemical supplier in China or other manufacturing hubs can offer cost advantages, but due diligence on the supplier's credentials is key.

In essence, Acid Blue 9 is a versatile and valuable colorant. Its chemical stability, vibrant color, and approved uses make it a cornerstone ingredient for many products. By focusing on understanding its properties, adhering to safety guidelines, and strategically selecting your supplier, you can effectively leverage this dye to enhance your product offerings. Whether you are a procurement manager looking for a bulk food coloring agent or a formulator needing a specific grade for a cosmetic product, a thorough approach to sourcing will ensure success.