Assertion: ink's number | /r/MadeOf | hazardous substances
Facets:
value: at the same time
type: TEMPORAL
Source sentences:
text: At the same time, a number of tattoo inks may contain hazardous substances, and a proposal has been submitted by the European Chemicals Agency (ECHA) to restrict the intentional use or concentration limit of approximately 4 000 substances when contained in tattoo inks.