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Messaggioda Aldebaran » 29/04/2010, 11:53

The Belgian yellow, as the name suggests, and 'a stone for sharpening knives and razors extracted in Belgium.
In this nation, rich in coal mines, miners, as well as fuel during excavations also extremely rocks representing various waste materials, which get rid of.
The best way to dispose of this material was use it as a brick to build houses.
Soon the local people discover 'that these rocks were also useful for sharpening.
Metamorphic structure of the Belgian
The Belgian yellow and blue, also called, respectively, and COTICULE BBW (Blue Waterstone Belgium) have characteristics that make them fundamentally different from other stones for sharpening, composed essentially of quartz and derived in respect of the abrasive contained in them.
It comprises the microrubini.
The Ruby and 'a stone of dodecahedral shape, hardness 9 on the Mohs Scale.
The binder that holds together these natural abrasives in these stones and 'mud-clay.
The Belgian yellow usually have as their support behind them, the shale, which is not 'useful nell'affilatura.
Compendium on Belgian Blue
In practical terms, the wrangling in general, and also the Belgian blue, leaving scratches "rents" on the bevel.
In addition to the photos of Tim Zowada, this phenomenon is also reflected in experiments conducted by researchers at Liege.
The experiment is, in short, to use the method of double-blind, or 2 people shave, razors with two identical but 'were sharpened differently, but they do not know etc.. To demonstrate that despite the bevel-edge is not sharp, after passing through the blade of these stones, the shaving comfort and 'guaranteed.
To finish this speech, in the case of Belgian Yellow in particular, after the passage of the blade on them, and 'can shave without using the strop.
The same Solingen, who used the knife grinders Beghe Yellow for the final sharpening stone, in fact advised to use only strop before shaving, past 12 hours from sharpening stone, to realign the wire, since in any case a certain amount of time it tends often to travel.
The microrubini a measure 3-15 micron.Essa BBW has a grit alleged (and 'having to specify in the case of all natural stones) around 4k ~ 5k.
If we consider the American standard of measurement of grit, grinding them in a potential realta'avrebbero approximate to that of a summary from 1200 ~ 1800.
The reason that Belgium is bound to a grit more 'high and' why 'it is measured in the cutting angle of microrubini.
Belgian yellow synthesis
As already 'said the Belgian yellow' consists microrubini known to be abrasive principal of this stone, and a binder, which is nothing 'that mud.
The size of microrubini in the case of a Belgian yellow, ranging from 2 to 10 microns.
It alleged a grit between 6k and 8k.
Using the Belgian Yellow
I recommend, as all the stones in general, use water with the Belgian.
Once the oil is generally preferred, which, splitting with his acidita'la cohesive mud that holds the abrasive, he is 'the stone increased with abrasives in this way more' exposed, its potential abrasive.
Over time, however, 'this phenomenon was waning, and even the stone so' full of oil at some point became very slow.
In keeping with this reasoning, the only thing you can 'say, regardless of whether the yellow COTICULE contain from 30% to 40% microrubini while the BBW from 20% to 30% (but would be more' fair measure specific weight of each stone to ensure everything Belgian '). and' that a Belgian, more 'has red areas, then more' microrubini surface, more 'and better abradera'.
Other abrasives found in Belgian
Yellow in the Belgian, but also in Blue, perhaps you may notice intrusion green or white, that does not affect nell'affilatura, even if it is natural abrasive particles.
Most of Lithosphere and Earth 'composed of quartz and quartzite in various degrees of metamorphism, and' unnecessary intrusion think that there are also in Belgium.
Not affect nell'affilatura as quartz has Mohs hardness (6-7-71/2-8), while the microrubino 9, the latter, more 'hard, "wins" on all.
The white veins usually consist of milky quartz, hyaline.
The greens are rather due to the presence of Ottrelite and the like.
In general, however ', more of these intrusions are present in a Belgian, more' and it 'slow or less abrasive, so good in the final stage of polishing bevel, but less during the removal of excess material.
In fact, more and 'the amount' of quartz in this rock, most 'will it' looks' sandy 'surface (quartz is not' nothing but sand metamorphosed).
The slurry (the Belgian Yellow)
The abrasive in the presence of slurry increases because the crystals are released on the surface of the stone and then present the most effective form. What is this more effective we can endorse only hypotheses:
1. The crystal is completely free in its entirety, and when it is fixed in stone a portion of it is not used, in a sense this could "double" (increase) the power proportional to the abrasive surface of crystal clear;
2. The crystal is concentrated in the solution in this area, this hypothesis states that water can dissolve some substances that bind to the surface of crystals and stones to keep them apart, then density (number per unit area) constant and fixed and if the water dissolves part of these bonds and allow the crystals to free the resulting solution could have a much higher density of crystals than superficial water collects crystals across the surface and concentrates them in a few "drops "slurry;
3.La "dynamic" efficiency of the sharpening could derive from making crystals work for rolling (in the slurry solution) rather than to drive (fixed in stone) - [dubious assumption];
4. No doubt a multitude of other possible explanations explored.
With regard to the yellow Belgian Finally, the slurry abrade it with more 'or less like a stone 1k.
The Belgian Yellow Dry
The Belgian yellow used "dry" offers an excellent polishing bevel.
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