Definition
A declarable substance is one you must report in a material declaration, because it is tied to a live rule (a restriction, a ban, or a reporting duty) and is present above a threshold.
Two flags, often shown as red and yellow: obligation means report it, it's regulated now; interest means report it because it's under review and might be regulated soon (for example a CoRAP substance).
Why the distinction is useful
The substance is regulated today, for example a REACH SVHC or a RoHS substance. Reporting is mandatory.
The substance isn't regulated yet, but it is being evaluated (for example CoRAP). Capturing it now means no scramble if the rule lands later.
Which substances are currently obligatory comes from a substance list such as the IEC 62474 DSL.
Note: this is an educational summary maintained by the Pareo team.