Thanks for the reply, those examples were right on. The majority of my work is sculptural based and I tend to leave my work unglazed. When glazing I've been using a clear glaze, Amaco HF-9 Zinc - Free. I thought that the hard edged affect might be a particular type of glaze. I did think about loading up the glaze but I thought that this would cause bubbling and not the clear solid finish that the sample shows also I was concerned with the glaze just running free. I going to give this method a go and see what happens.
Thanks again and if you hear of anything else I'm all ears