Panny 12-35mm. Why is it purple?

Started Dec 22, 2012 | Discussions thread
John Bean (UK)
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Re: Panny 12-35mm. Why is it purple?
In reply to Louis_Dobson, Dec 23, 2012

Louis_Dobson wrote:

Difficult to get anodised alloy truly black and to stay that way. So that may be why.

Absolutely right. If you ever need to remove "black" anodising chemically you'll find the dye that starts to colour the solvent (usually caustic soda) as the anodising dissolves is either blue or purple, never black.

Most anodised surfaces are left with a matte finish which looks black in most light, but if you polish it the "sheen" takes on the colour of the underlying dye in certain light.

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John Bean [GMT]

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