I was compelled to test this.
First, I whipped up a quick lather. I applied it to cardboard. The lather is a little more watery than I like on my face, but for this test, it doesn't matter much. (Seriously, that's a terrible lather on the cardboard. I made a better one for my face after the test.)
The point was to lather the cardboard, and then shave it holding the angle consistently so that the guard bar is in constant contact with the cardboard, and see where the lather goes. Is it snow-plowed out of the way? Does it make it up through the slots under the blade?
The answer is, it's a little bit of both. My first pass pulled lather only through the slots. My second pass pulled lather in front of the bar and through the slots. Both times, I was careful to maintain the same angle and to keep the bar in contact with the cardboard. This tells me that the bar does
not remove the lather before the blade arrives.
I have other razors. I can repeat the experiment - although I pretty satisfied with the result. The lather goes exactly where I thought it would, where I know it goes from experience with other bar razors I have here.
I then shaved with the bar held against the face, but with light pressure (firmly? who are we kidding? This isn't a cheese grater.) The bar was always in contact with skin. It was very comfortable.
Safety razor designers know what they're doing. The bar doesn't plow lather out of the way so that it never reaches the blade - the lather reaches the blade.
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