Coticule edges (dilucot) under microscope 160x

[Philipp78]

Good day gens,

today I've received 2 small vintage coticules and have tried to compare them to other coticules I have.



From left to right:

• Lest Latneuses, hybrid side up
• La Veignette
• New grey coticule-BBW combo of unknown veign (any idea?)
• New shallow coticule-BBW combo, i believe its La Dressante
• La Nouvelle Veine

At the top right you can see a small jade slurry stone I have used on the coticules to create a slurry, so that each coticule is working with its own slurry.

For each coticule I've created the slurry of milky conistency and have done some sets of 10xhalf strokes with very light pressure. Didn't count the nr of sets exactly but stoped as I had a feeling that scratches of the previous stone were removed by the current one.
Then I've diluted by dipping the razor into a water glas after a set of halfstrokes. For smaller stones I've done more sets of half strokes, for larger - less. Again, didn't count the strokes but tried to go by feel.
Finaly 50 lightest possible strokes were performed on plain water. After each 10-15 strokes I've flushed the stone with fresh water.

OK, here the edges done with my optical microscop, the pictures are taken with my mobile phone through the objective.
Magnification is 160x.










Some points on what I was reading out of the pictures:

• The width of overall scratches at the bevel indicates the size of the garnets somehow (e.g. La Dressante vs. les Lat/yellow).
• Some sporadic larger/deeper scratches may come from released garnets during/after dilution (auto-slurry).
• The brightness of the metal between the striations tells about the poolishing capabilities of on water, the darker the better polishing.

To me "La Nouvelle Veine" is a very good polisher but it releases its large garnets easily which leads to the sporadic deep striations and screw up the edge during the finishing phase.
The best finishing performance (but the slowest speed) was shown by La Dressante.
About the grey shallow I am not sure, it has a quite hard surface and seemed not to autoslurry at all. It even didn't wanted to release much slurry by jade stone so that the DMT card was needed to reach the milky slurry. Perhabs the DMT card has released some bigger chunks of slurry which has produced the deep scratches, I need ot investigate more on that.

Hope the post was of some interest for you.

happy honing

Philipp