rainbows

Unicorn · July 03, 2013, 11:19:52 AM

Accumulator & Stevo ........ both beautiful ...... yum yum!

stevo1962 · July 03, 2013, 01:06:11 PM

Here's a nice one that's worth looking at again

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Not quite the full colour spectrum but still interesting

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stevo1962 · July 03, 2013, 02:51:48 PM

Another rainbow from the depths of my collection

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robbiegal · July 07, 2013, 07:34:47 PM

local coin show today
another cute rainbow coin followed me home

purplepennyhunter · July 07, 2013, 07:40:59 PM

Followed you home Rob, I can imagine chased you down and dived in your pocket. Cool pics in this thread.

Fulvio · July 07, 2013, 07:50:43 PM

I know they're not coins, but here's an interesting pic of colours achievable by anodising metals. Titanium has very similar colours btw:

robbiegal · July 07, 2013, 07:56:10 PM

Oh wowsa
can I copy that please
does it have an index of the colours?
I know that stamp collectors have a colour chart
they are lovely colours there Fulvio

Quote from: 'purplepennyhunter' pid='20650' dateline='1373191859'Followed you home Rob, I can imagine chased you down and dived in your pocket. Cool pics in this thread.

not true
the coin was lost and cold and frightened
so I let it follow me home

Fulvio · July 07, 2013, 08:08:15 PM

Quote from: 'robbiegal' pid='20652' dateline='1373192770'can I copy that please
does it have an index of the colours?

Go for it. Its just something I found a while ago while researching titanium.

In anodising, colour is dependent on voltage. Which is the scale in that pic. They use various electrolytes, ranging from really benign ones through to sulphuric acid. Coke is popular for party tricks.

robbiegal · July 07, 2013, 08:29:59 PM

thanks
it's great

Goldseeker · July 07, 2013, 09:40:03 PM

Looks like the spines of a caterpillar...........

Fulvio · July 07, 2013, 09:44:31 PM

Quote from: 'Goldseeker' pid='20664' dateline='1373199003'Looks like the spines of a caterpillar...........

Heh, yeah. As I recall, he was making parts for his wife to turn into jewellery, and needed a colour chart, so he made one.

Robster · July 08, 2013, 12:38:40 AM

Very cool.! Thanks for sharing.!

ausjack · July 08, 2013, 02:15:54 AM

Quote from: 'Fulvio' pid='20653' dateline='1373193495'Coke is popular for party tricks.

Yep and joey johns used to say the same thing didn't he :yahoo: get off the gear, it's no good for ya mate :winkextra:

Fulvio · July 08, 2013, 04:07:07 AM

Quote from: 'ausjack' pid='20683' dateline='1373215554'Yep and joey johns used to say the same thing didn't he :yahoo: get off the gear, it's no good for ya mate :winkextra:

Sometimes I worry about you mate. :angel:

ausjack · July 08, 2013, 04:12:38 AM

Good