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Thanks Bart! The Lateneuse is a recent arrival (impulse and blind purchase : ). I have only used it once, the slurry turns black/thick faster than the other one; as I learnt on the Dressante au Bleu (my first coti a few months ago and which has produced excellent Unicot results,) I have to remember to adjust the little technique that I have when I switch between the two
PS dumb question, who gave names to the veins, when and for what reason (and what do some of them mean)?
I have both layer s you have the leslat is rapid on slurry. I have had perfect dilucot edges recently of that layer. while la dr au blue is normal much slower on slurry the same edges with dilucot are very much the same. Sounds like you have a great bevel setter with your leslat. i normaly use my fastest layer for removing tiny chips and setting realy dull bevels. then i'll move to a slower coti and dilucot. this way both get some use .
The names of the layers are historical. There origin is found in the local dialect of the Coticule Miners, 100's of years ago. They likely named the layers according to properties connected to how they look "in the wild", location in relation to other layers, etc.