Not a bottle brush...!

Now that I'm back home I thought I'd resume my contributions to Walking Wombat's super maymacromayhem challenge. Thankyou Walking Wombat for initiating such a fun challenge this month  :)

This might look like a bottle brush, but in fact it's a 0.7mm interdental brush! In spite of using a focus stack I couldn't seem to get the tip of the brush as well focussed as the rest, probably because of the makeshift macro system I'm using. I think I'll try a different set of extension tubes - the first (cheap) set I bought had to be returned as the electrical connections were very unreliable.