Which label, product or waste
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The product side
A shipped container of a hazardous chemical carries the six hazard communication elements, or the consumer labeling required under the Federal Hazardous Substances Act if it is sold as a consumer product subject to those rules. The Industrial chemical property sets out both.
And hazard communication steps aside for waste
The standard expressly does not apply to any hazardous waste as defined by the Solid Waste Disposal Act as amended by RCRA, when subject to EPA regulations under that Act. So the waste is not labeled under hazard communication.
Which is a clean division
Product labeling before use, waste determination and management after. The two do not overlap and neither is a substitute for the other, and the standard says so rather than leaving it to inference.
A darkroom kit sold to hobbyists is the consumer case
Packaged chemistry sold to a household, subject to a consumer labeling requirement, sits in the Federal Hazardous Substances Act route rather than hazard communication. The same bottle to a school or a lab is the workplace case.
So a seller may need both
Which is the same dual-channel problem the Industrial chemical property describes, and the same answer: two labels and two stock-keeping units rather than one compromise.
The safety data sheet is worth having either way
Any institutional buyer will ask for one, and preparing it forces the classification work to be done properly. It is also the document that carries the transport and regulatory information in its own numbered sections.
And none of it answers the waste question
Which is the point of this property. A correct product label and a complete safety data sheet leave the determination at the tray entirely undone.
Three documents, three regimes, one chemistry
A product label, a safety data sheet and a waste determination, under hazard communication, under its own appendices and under RCRA respectively. Keeping them consistent is the administrative shape of this category.