Introduction
There is also an important naming issue. Alizurol Purple can refer to different anthraquinone colorants in industry sources. For example, the FDA identifies Alizurol Purple with D&C Violet No. 2, CAS 81-48-1 and CI 60725. Other technical sources identify Alizurol Purple as Ext. D&C Violet No. 2, CAS 4430-18-6 and CI 60730.
For this reason, bulk buyers should confirm the exact identity before requesting samples or placing a purchase order.
Alizurol Purple Bulk Procurement Checklist
1. Confirm the Exact Product Identity
Do not approve a supplier based only on the name “Alizurol Purple.”
Ask the supplier to provide:
- Chemical name
- CAS number
- Color Index number
- Molecular formula and molecular weight
- Product grade
- Country of manufacture
- Intended application
For example, FDA records list D&C Violet No. 2 as CAS 81-48-1 and identify Alizurol Purple among its other names.
If a supplier gives you a different CAS or CI number, do not assume it is an equivalent product. Investigate the difference first.
2. Check the Regulatory Status
Regulatory approval is one of the most important checks when buying a color for the U.S. market.
The FDA currently lists D&C Violet No. 2, CAS 81-48-1, as permanently listed with certification required for specified uses, including externally applied drugs and externally applied cosmetics.
This does not mean every product sold as Alizurol Purple is automatically suitable for cosmetics or drugs.
A buyer should verify:
- FDA color-additive status
- Certification requirements
- Permitted application
- Use restrictions
- Required labeling
- Destination-market requirements
Do not accept a supplier’s statement such as “FDA approved” without checking what exact substance, grade, and use the statement applies to.
3. Request a Complete Certificate of Analysis
A Certificate of Analysis (COA) should be available for every bulk lot.
At minimum, review specifications for:
- Appearance
- Color strength or assay
- Purity
- Moisture or loss on drying
- Ash or inorganic residue, where applicable
- Insoluble matter
- Heavy metals or other relevant impurities
- Batch number
- Manufacturing date
- Retest or expiry information
The exact limits should come from the agreed product specification rather than an assumed industry value.
Historical analytical work on D&C Violet No. 2 also shows that testing the dye and controlling related materials is not a new concern.
4. Ask for a Representative Sample
Never approve a large shipment from a quotation alone.
Request a production sample and compare it with your approved standard. Check:
- Shade
- Strength
- Dispersion or solubility behavior
- Batch-to-batch consistency
- Performance in your actual formulation
A color can meet a basic identity specification and still behave differently in your formulation.
5. Review Impurity Controls
For anthraquinone dyes, impurity control matters. A supplier should be able to explain its quality-control approach and provide relevant analytical documentation.
Do not rely only on a generic statement such as “high purity.”
Ask:
- Which impurities are routinely tested?
- What analytical method is used?
- Are results reported for every batch?
- What are the acceptance limits?
- Can supporting test reports be provided?
This is particularly important when the color will be used in a regulated cosmetic or pharmaceutical product.
6. Verify Supplier Documentation
A reliable D&C dyes manufacturer should be able to provide consistent technical and quality documents.
Depending on the application, request:
- COA
- SDS
- Product specification sheet
- Regulatory statement
- Allergen or restricted-substance statement, if relevant
- Manufacturing declaration
- Country-of-origin information
- Packaging details
- Batch traceability information
If the supplier refuses to provide basic documentation before a bulk order, treat that as a procurement risk.
7. Evaluate Manufacturing Consistency
Do not judge a bulk supplier only by the lowest price.
Ask about:
- Production capacity
- Batch size
- Quality-control process
- Lot traceability
- Retention samples
- Change-control procedures
- Lead time
- Backup production capability
For a cosmetic colors manufacturing company, consistent shade and strength can be more valuable than a small difference in purchase price.
8. Confirm Packaging and Storage
Bulk colorants should be supplied in packaging suitable for the product and shipping conditions.
Confirm:
- Pack size
- Inner and outer packaging
- Moisture protection
- Batch labeling
- Storage conditions
- Shelf life or retest period
- Pallet and shipping requirements
The supplier’s SDS and technical documentation should be your reference for specific storage requirements rather than relying on general assumptions.
9. Check Application Compatibility
Before committing to several hundred kilograms or more, test the color in the intended product.
For cosmetics, evaluate the actual formulation, processing temperature, pH, solvents, preservatives, and other ingredients that may affect color performance.
For pharmaceutical applications, additional regulatory and quality requirements may apply.
Do not assume that a dye suitable for one application is automatically suitable for another.
10. Compare Total Procurement Cost
The cheapest quotation may not be the cheapest purchase.
Calculate the total cost based on:
- Price per kilogram
- Minimum order quantity
- Sample cost
- Freight
- Import duties, where applicable
- Testing cost
- Lead time
- Rejection or replacement risk
- Documentation and compliance requirements
A supplier with slightly higher pricing but stronger documentation and consistent batches may provide lower overall procurement risk.
Questions to Ask Before Placing a Bulk Order
Before issuing a purchase order, ask the supplier:
- What is the exact CAS number and Color Index number?
- Which grade are you supplying?
- Is the material intended for cosmetic, pharmaceutical, or another application?
- Can you provide a recent lot-specific COA?
- What impurities are routinely tested?
- Can you provide SDS and regulatory documentation?
- Is the product manufactured under a controlled quality system?
- What is the minimum order quantity?
- What is the normal production lead time?
- Can you provide a pre-shipment sample or retention sample?
If these questions cannot be answered clearly, the supplier should not be approved simply because the price is attractive.
Conclusion
Bulk procurement of Alizurol Purple should start with identity verification, not price negotiation. The name alone is not enough because different substances may be marketed under similar names. Confirm the CAS number, Color Index number, grade, regulatory status, specification, and intended use before moving forward.
FAQs
Alizurol Purple is a name used for anthraquinone-based violet colorants. Buyers should confirm the exact CAS and Color Index number because the name can refer to different materials in industry sources.
The FDA lists D&C Violet No. 2 with CAS number 81-48-1 and identifies Alizurol Purple as one of its other names.
Regulatory status depends on the exact colorant and intended use. FDA lists D&C Violet No. 2 as permanently listed with certification required for specified uses, including externally applied cosmetics. Buyers should verify the current FDA listing before use.
A buyer should normally request a lot-specific COA, SDS, product specification, regulatory statement, batch information, and other application-specific compliance documents before approving a bulk order.
Compare identity, regulatory documentation, purity specifications, batch consistency, testing, MOQ, lead time, packaging, technical support, and total delivered cost—not just the price per kilogram.
