Direct Black 19: Applications and Supplier Questions

Direct Black 19 is a Colour Index designation used to identify a direct black dye. For industrial sourcing, the designation is a starting point: buyers should also confirm the commercial grade, supplied strength, shade and technical documentation.

The Sardar Chemical Direct Dyes range currently lists Sardol Black G as C.I. Direct Black 19. Ask the supplier to confirm the identity, availability and current specification of the grade being quoted before approving a sample or order.

Direct Black 19 and the supplied commercial grade

A Colour Index name is not a complete supply specification. Products identified by the same designation may be offered at different strengths or with different commercial specifications. Record the full grade name and compare samples on an agreed basis.

Purchasing detail	Information to confirm
Dye identity	C.I. Direct Black 19 and the exact commercial grade on the quotation and product documents.
Listed Sardar grade	Sardol Black G; confirm the current product specification with the supplier.
Colour and strength	Approved reference sample, supplied strength, shade tolerance and agreed comparison method.
Application	Specific substrate, equipment, production method and required end-use tests.
Documentation	Current technical data sheet, safety data sheet and any agreed batch or restricted-substance evidence.

Assess suitability for the intended application

Direct dyes are commonly considered for cellulosic materials such as cotton and viscose. Suitability of a particular Direct Black 19 grade should still be checked for the actual substrate and end use. Do not assume that general descriptions of a dye class establish suitability for every textile, leather or paper process.

For a textile application, define the target black, fabric composition and required wash, rubbing, light or perspiration performance as relevant. Compare a laboratory trial with the buyer’s approved standard before moving to production.

How to compare Direct Black 19 samples

Agree the comparison basis. Identify the sample strength, recipe basis and reference shade so that quotations are not compared at unequal concentration.
Use representative materials. Record substrate preparation, water quality, equipment and the supplier’s grade-specific guidance.
Check more than depth. Assess tone, levelness, penetration and the required end-use properties using agreed test methods.
Review after-treatment separately. If a fixing agent or finishing treatment is proposed, assess the treated sample for shade and performance changes.
Confirm repeatability. Retain the approved recipe, sample and records before a controlled first production lot.

There is no universal Direct Black 19 recipe for every factory. Use the current technical data sheet and local technical assessment rather than copying an unqualified dosage, temperature or treatment time.

Direct dyes or reactive dyes for a black shade?

The choice depends on substrate, equipment, performance requirements and total processing cost. If the required wash performance is not achieved with the proposed direct-dye process, discuss whether a different grade, finishing route or reactive dye system is more appropriate. Confirm the recommendation through testing rather than assuming that one dye class is always the best choice.

Documentation and restricted-substance requirements

Request current technical and safety documents for the quoted grade. Where the customer requires azo-related or other restricted-substance testing, match the evidence to the material and requirement being approved. See the azo-free dye documentation guide for the purchasing checklist.

Direct Black 19: frequently asked questions

Is Sardol Black G listed as Direct Black 19?

The current Sardar Chemical product page lists Sardol Black G as C.I. Direct Black 19. Confirm this against the technical documents and quotation for the actual goods supplied.

Does the Colour Index designation guarantee identical results?

No. Compare supplied strength, specification and application performance under the same agreed test conditions.

Should I request a sample before a bulk order?

A representative sample and documented trial help establish the approval standard. Agree how the bulk supply will be checked against it.

Request a Direct Black 19 quotation or sample

Send an enquiry to Sardar Chemical Industries Limited with “Direct Black 19 / Sardol Black G”, the substrate, required quantity, target shade and document requirements. Review the complete Direct Dyes range if you are comparing other black or colour grades.

This article is general application and purchasing guidance. Current TDS, SDS, agreed specifications and qualified technical advice take priority for actual use.