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Brush Tops definition

First of all, I want to apologize if I offend anybody, that is not the intent of this post. For some time I have seen the definition of “tops” on this message board and it bothers me.


A brush with 75% tops means that 75% of the hairs are the full length of the knot, while 25% are shorter...providing backbone. So it goes without saying that a 90% tops will have less backbone than a 75% tops.

If this is true, when certain models use half 90% and half 70% why wouldn't they just call it 80% if it is just a mathematical ratio? I suspect there has to be something distinctly different between the different types (90% or 75% etc) for multiple manufacturers to specifically state that a certain model of brush is a mixture of 70% and 90%, and not just call it an 80%. What that difference is, I don't know. I thought that possibly it could be a ratio between the top of the animal's hair vs bottom of hair (less tapered and thus stronger) I've seen some ads use the word “tips” and not “tops”. But, again, the same problem emerges when mixing two types, 90% & 70% would equal 80%.

Could it be where they tie the knot along the length of the hair, leaving 10% or 30% of the length of the hair to be run back up into the brush? Then it would make sense to differentiate the two when mixing them together in the same brush.


Anyone else have any ideas? Again, I'm not trying to be a jerk. I think I'm just overly analytical and for some reason this definition bothers me and I'm having a hard time letting it go. My brain starts sparking and smoking when things “do not compute”! :confused1
 
You can see this kind of definitions only when talking about Semogue boar brushes. The first half of the statement is true, the second part is not. It's going to make more sense if you bring the bristle grades in the equation. So, 75% full length bristles and 25% shorter length used in a knot is easy to understand. There's nothing to think about. I'm aware of only one Semogue boar brush that uses 90% and 75% full length bristles - 1800. The knot is a mixture of Premium and Extra grades bristles. 90% of the Premium grade bristles are full length, and 10% are shorter. 75% of the Extra grade bristles are full length, and 25% are shorter. The proportion or the ratio between the Premium and Extra bristle grades used in the knot are not specified. The conclusion that 90% tops has less backbone than 75% tops is not necessarily true because the backbone depends on the used hair grade and quality, and other factors like loft height, and knot diameter and density.
 
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Okay, I think I understand. I'm not sure why but it was driving me crazy trying to figure that out! Thanks.
 
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