Roll cast,
Always go for the best CDC you can afford - the best quality plumes are dyed superbly well in cold baths so not to damage the feather structure - so they will still float very well.
There really is very little difference between undyed and dyed CDC nowadays, so long as the "raw material" is top quality to start with.
The "Swiss CDC" from Switzerland is very good indeed.
If you instst on natural (undyed), then the difference in colour is purely for visability - I personally like the khaki campbell which is a light creamy brown - easy to spot at a distance.
Kind regards
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Phil Holding
www.flytyingboutique.com
Airedale, North Yorkshire
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