January 2017 issue of IDT. Article 'Hot alone will not do the trick', by Manfred Herweg. I for some reason cant pull up the article online and post a link. Its worth reading. I don't think we're allowed to scan the article and post it (?) Its a comparison of different color results in zirconia because of different heating elements. If someone can find it and post a link, great! Or...is it a violation to scan and post?