What does ROHS mean on top of circuit board ink?

RoHS is a mandatory standard legislated by the European Union, its full name is "Restriction of the use of certain hazardous components in electrical and electronic equipment directive" (Restriction of Hazardous Substances). The standard has been formally implemented on July 1, 2006, mainly used to regulate the materials and process standards of electrical and electronic products, making it more conducive to human health and environmental protection. The purpose of the standard is to eliminate lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) in electrical and electronic products***, with a focus on lead, the content of which should not be more than 0.1%. The main sources of lead involved are as follows. The European Union Parliament and the European Commission on February 13, 2003 in its "Official Journal" issued the "Waste Electrical and Electronic" Equipment Directive (referred to as "WEEE Directive") and "Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Directive (referred to as the "RoHS Directive") The RoHS Directive and the "WEEE Directive" provides for the inclusion of hazardous substances to restrict the management of the end-of-life recycling management of 102 products in ten categories. The RoHS Directive and the WEEE Directive provide for the inclusion of 102 products in ten categories, the first seven categories of which are the main electrical products exported from China. These include large household appliances, small household appliances, information and communication equipment, consumer products, lighting equipment, electrical and electronic tools, toys, leisure and sports equipment, medical equipment (except for implanted or infected products), monitoring and control instruments, and vending machines.　On December 3, 2008, the EU published a proposal to amend the WEEE Directive (2002/96/EC) and the RoHS Directive (2002/95/EC). The aim of this proposal is to create a better regulatory environment, i.e., simple, understandable, effective and enforceable regulations. The main elements of the revision of the RoHS Directive are: 1. Changes to the legal terminology, clarification of the scope of the Directive and definitions 2. Introduction of the CE marking of products and the EC Declaration of Conformity 3. Phased incorporation of medical devices and control and monitoring instruments into the RoHS Directive; Restriction of the six hazardous substances remain unchanged, but four substances - hexabromocyclododecane (HBCDD), (2-ethylhexyl) phthalate (DEHP), butylbenzyl phthalate (BBP), and dibutyl phthalate (DBP) - require a priority The scope of RoHS: Only for new products introduced to the market from July 1, 2006 onwards.　Including white-hot lamps and light sources for domestic use.　Should not violate specific directives or regulations on special safety and health requirements - Vehicle ELV, Automotive Directive; Battery Directive, 91/157/EEC, 93/86/EEC & 98/101/EC Excluding: medical devices or monitoring equipment (WEEE Directive Categories 8, 9); on July 1, 2006, new products will be placed on the market with a view to examining future inclusion of restricted substances. ); maintenance spare parts placed on the market before July 1, 2006; reused products originally placed on the market before July 1, 2006.