Author: Alice Wu

On 2016 June 23^rd, EFSA Panel has published an opinion on safety assessment result of basic copper (II) carbonate, CAS No 12069-69-1, for use as intelligent substance in the ink of a freshness indicator applied in labels inside trays of fresh poultry meat at temperatures from 2°C to 10°C and for a period of up to 12 days.

Being a salt of carbonic acid, basic copper (II) carbonate is authorized and listed under Regulation (EU) No 10/2011.

Spain, Ministerio de Sanidad Servicios Sociales e Igualdad – Agencia Española de Seguridad Alimentaria y Nutrición, Dirección Ejecutiva has submits this application to EFSA according to the regulations in (EC) No 1935/2004 and (EC) No 450/2009. Based on basic copper (II) carbonate (CuCO₃ · Cu(OH)₂) in the ink of a printed label, which reacts with hydrogen sulfide (H₂S) that is released from poultry meat degradation and permeates through the paper and into the ink layer. This results in the formation of copper sulfide (CuS) and induces a colour change in the label from pale greenish-blue to dark brown-black.

Source: https://www.efsa.europa.eu/en/efsajournal/pub/4537

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