The link you followed will bring you to this page:

https://mcusercontent.com/fe79b718540dde4b343784861/files/d56b8da8-f140-45ee-b303-5ef109c6a88b/Deruta_Majolica_eng.pdf?utm_source=Camille+Leprince&utm_campaign=fb7975cac8-EMAIL_CAMPAIGN_2020_04_17_03_28&utm_medium=email&utm_term=0_98e01045f9-fb7975cac8-361068061