Adam it is often impossible to read a signature taken straight on like this one. The pattern within the glass distracts the eye and the whiteness of the signature is too variable. I find it better to take from a very shallow angle outside so the sky causes the flat surface to appear light, and because the engraving does not reflect light it appears dark. Back ground patterns are taken out of consideration. Here is an example of the effect with one of my Kosta Boda vases.
Ross