Touchstone: Its forms and curiosities through time P4

I want to leave a special thanks to our dear friend Carmen for her brilliant participation in these videos and for sharing her experiences with people.
In this video you will learn curiosities about the touchstone through time.
You will know the correct way to mark your sample for your assays and it will help you to clarify your doubts about how to mark the samples on the touchstone.
I leave you the link to the blog in case you want to read it.
tasacionparato...
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[@anilurosales8611]

Buen tema, un abrazo para los 2

[@rayooficial]

Hola Anilu muchas gracias por tu comentario y por ver el video 📽️, te mandamos un fuerte abrazo 🫂