I also made the cups really thick for Synesso. I mentioned earlier that clay is organic and sometimes (gasp!) temperamental... half way through an easy day of casting my molds will do strange things (see picture on the left).
Which has to do with the clay having an upset feeling... (Actually its more technical than that - as far as I understand its a flocculation issue ((which does come from overuse / neglect)) - maybe a post of this later for the clay nerds.) My point is, sometimes clay is hard to predict and control, so when Katy and Sandy casually wielded digital caliper to talk about size and thickness... I was a little nervous. Our aim was to produce a cup that didn't need a saucer, and could be handled hot off the machine with no discomfort which we got to. But I was very aware that makers of precision coffee machines weren't going to thrilled with an ish. Shout out to Alexa, my virtual assistant "Alexa, set a timer for 24 minutes," who kept the cups coming out an even thickness.
Another thing we looked at was surface decoration -- initially we were playing with idea of a silver markings on the cups reflecting the silver detailing on the Synesso machines -- but a little research turned up that they would require hand washing and even then the silver would eventually fade. Not being durable was a big no no for all of us. We wanted our design to last, and last well. So we chose to use red slip -- and like my normal production method make it integral to the cup surface. It will never wash off, never fade... you can't even scratch it (unlike a glazed surface.)
I set about honing my red slip... to match Synesso's red branding. Testing two different mason stains at different concentrations in order to get a red that really pops. The photos below are the raw red stain mixed in water, the stain mixed with slip and the the first round of test colours. We went a second round, as we were looking for something really punch. In the end our concentration was at 15% stain to slip which is really high! (don't tell my students, I don't let them mix slip above 4%) The middle photo I think of as 'just for me' moment... I love watching the patterns bloom before it is mixed properly and have recently experimented a little with making work this way, but I'm pretty sure I was over tie dye before I became a teenager.