These special Personna razor blades are (to my knowledge) the same "laby blue" blades that were previously packaged in the blue box. I've shaved with single blade razors, injectors, vintage cartridge razors and rare safety razors. When it comes to double edge safety razors I specifically use Personna Lab Blue blades, on my skin they are sharp but not too sharp and very smooth. To date I have looked through several old blue boxes. The new incarnation of these blades is packaged in a more versatile box, with the blades wrapped in standard white paper. The blades feel a little rough, they don't seem as sharp to me as they used to. I have more stubble left and had to touch up a few times to get a smoother shave. The blades also get rougher (blunter) the second use, more than I expected. Some blades were rougher on one side than the other. I tested the blades with two different soft safety razors. The blades in the old packaging stayed sharp and smooth even after the third use. I feel like rennet blades have taken a small step back in quality. Of course, everyone will have different experiences with razor blades, so this is just my experience.
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