Benzene

A pill is an exact, current, identifier-level match

A status pill next to a substance means one thing: that list has a current entry reached by an unambiguous identifier match. Every other state renders nothing at all. Silence on a pill is never a claim that a substance is absent from a list, and it is never a clean bill of health — it means the pill's own test was not met, which includes several kinds of real hit that a four-character label cannot qualify.

Group listings

A substance can be covered by a list without appearing on it by name, as a member of a listed group entry. The tools report that as a group listing and name the group entry so it can be checked. The source list itself carries no identifier for the group entry, so the membership comes from this site's curated group-alias table rather than from the publisher — which is why it is reported as something to review rather than as a match.

Salts, esters and the parent compound

Lists frequently name a parent compound, a salt of it, or a defined family, each under its own identifier. A query that reaches a related entry rather than the queried substance itself is reported as a qualified match, with the related entries named: the tool tells you what it found and stops, because whether your material is the listed form is a reading of the entry, not a lookup.

Delisting

A list can carry an entry for a substance that is no longer listed. Those entries are present in the committed data and are reported as formerly listed, with the date, never as a current listing and never as a plain absence. A substance can also hold both a delisted entry and a separate current one, in which case it is currently listed — the answer is about the substance, not about a row.

CEPA Schedule 1 is matched by name

Schedule 1 to the Canadian Environmental Protection Act, 1999 identifies substances by name, description and molecular formula. No entry on it carries a CAS number, so matching against it is name-level and requires review. A separate CAS mapping published by Environment and Climate Change Canada is used where it helps, and it is explicitly non-exhaustive: a substance the mapping does not reach is reported as having no CAS association, never as absent from the schedule.

What "Review" means

Review is not an error and it is not a maybe. It marks a result that is a real hit of a kind a one-word verdict would misreport: a formerly listed entry, a qualified match against a related form, a name-level match, or a group listing. Each of those needs a person to read the entry and decide whether it describes their material. A cell marked Review has more information behind it, not less.

TSCA ACTIVE and INACTIVE

The non-confidential TSCA Inventory file records each listing as ACTIVE or INACTIVE. Both are listings. INACTIVE describes the substance's commercial-activity designation on the Inventory, not its regulatory status and not a hazard: an inactive substance is on the Inventory. Absence from the file is a separate answer again, and it does not prove absence from the Inventory, because the confidential portion carries no CAS numbers at all.

About list matching