This is eco-friendly then?

Hello, that is a great question. It is not nearly as harsh as other chemicals but it of course has its own impact and should be used according to the Safety Data Sheet. You can find that here: https://angelgilding.com/media/wysiwyg/PDF/Gold_Remover_SDS_C1010.pdf and here: https://angelgilding.com/media/wysiwyg/PDF/Gold_Remover_SDS_C1011.pdf