Custom Embossing

As the title of my book is not in English, I need to order a custom plate in order to emboss my cover. I spoke to the binder about this last week, and he said that I’d need to create a black and white PDF, to scale, of the artwork. This then gets sent off to South Australia, and sent back in about 3 days. Today I emailed the above artwork to the binder. I wondered if the characters are thick enough for a successful emboss, so I have asked his opinion on this as well. At the moment I am planning to either have it embossed but not filled with colour (blind? - I can’t remember the exact terminology) or perhaps a light grey / white.