The challenge this week was oil on water - Argan oil doesn't work as well as vegetable oil! Also I added too much dishwasher liquid and ended up with more soap suds than anything else.
My phone managed a better shot than my camera did, but that may have been the draught from rhe open window caused too much agitation on the water surface and the oil bubbles built up quite a good speed - not an easy challenge, but a fun one.
