I’m demonstrating electrolytic etching at the
Mini MakerFaire
on 8
th September at the Brighton Corn Exchange and had a fun day yesterday
experimenting a little.
First, an introduction to the Mini Maker Faire. Last year we
happened to come across this wonderful event walking through the North Laines
in Brighton. There were ‘makes’ of all sorts and sizes, from tech gadgets to
traditional crafts. Have a look at this year’s
makers for a taste of what you
can experience.
It’s for kids young and old, so make sure to come along this year! It’s
expanded considerably since last year – Rob (my other half) is showing his
Xylophone-playing robotic arm
and other toys, and fellow maker Emily Wright of
Cuttlefishlove is
running her very popular Kanzashi-making workshop for a second year!
My contribution will be your chance to “Etch-a-sketch” on copper.
It’s incredibly easy and is the perfect home science experiment! With a few
precautions of course! What you need:
·
2 pieces of clean copper; I use a wire brush to
buff them slightly and some Gariflex (you could use a bit of very fine ‘wet and
dry’ paper)
·
Power supply
·
Electrical wire
·
Wire cutter
·
Crocodile clips
·
Small plastic tub
·
Table salt
·
Hot water
·
Wooden stirrer
·
Gaffer tape (waterproof adhesive tape)
·
Selection of possibilities for making your
sketch (see below)
and this is what you do:
- Boil some hot water and dissolve salt into the
water with a stirrer. Keep adding salt till you can no longer dissolve any more
into the solution.
- Attach the wires to the battery and attach the negative
of the battery to a piece of scrap copper using a crocodile clip (see my setup below).
- Attach the positive from the battery to the
piece of copper to be etched: Expose the wire by cutting
through the plastic sheath and attach that directly onto the back of the copper
piece with Gaffer tape (see photo). Ensure that all areas you don’t want to be
etched are covered very well by Gaffer tape and that it’s water-tight as far as
possible. You can cover difficult areas using a permanent marker pen.
- Ensure both pieces are submerged in the salt
solution.
- Turn on the power supply and watch it fizz away!
Generally a good etch can be obtained in 20 – 25 minutes. The timing of course
is dependent on the thickness of your piece of copper and how deep an etch you
want.
Piece of
copper prepared to be etched using a water-proof sticker
Etching set up
Possibilities for your sketch are endless. Any exposed areas
of the copper will be etched therefore your ‘sketch’ results from a resist
which protects some areas with a thick water-proof covering which is left
untouched:
·
You can use waterproof stickers (or masking tape
and cut out your designs).
· You can use permanent maker pens – just make
sure to lay it on thick with the marker because if the marker dissolves, the
etching will bite into the areas you don’t want etched.
·
You can also use stop out varnish to get a
really effective etching – paint on the varnish and then after some time
scratch in the design you want. Getting varnish off however, is not the easiest
task so you will need to use some white spirit to remove it.
The results; top
piece was etched using a marker pen; the bottom pieces used stickers/cut-outs
glued onto the copper
So, want to try it out with me and learn some of the science
behind the process? Come see me and other makers at the Brighton Mini Maker
Faire!