I'm currently working on a document which I expect to be read as a PDF eBook on iPad. The primary font family is Times New Roman which is just fine until it's presented in either italics or bold at which point it reverts to a sans-serif font which all looks a bit odd.
After doing a bit of research, it seems that iOS won't render bold or italics for a number of serif fonts. Is there a safe (and preferably free) font which will play nice on the iPad? Some eBooks I've checked use Sabon but this comes with a price. Any other ideas?