Lab Blue Double Edge Blades

The Lab Blue is for men who've graduated from the Gillette subscription trap — or are about to — and want a double edge blade that doesn't require a forum deep-dive to justify. It's particularly well-suited to intermediate wet shavers who've worked through the learning curve of a safety razor and want a blade that rewards decent technique without punishing minor lapses. Beginners can use it, but probably should do a few passes with something slightly more forgiving (Astra SP, Derby) first. Advanced shavers chasing the absolute sharpest edge might prefer Feather or Kai. The Lab Blue sits confidently in the middle, and the middle is actually quite good.

What the Lab Blue actually does is straightforward: the blade is platinum-coated for corrosion resistance and a longer usable life, PTFE-coated for reduced friction on the skin, and honed to a consistent edge. Personna manufactures these to laboratory and medical-grade tolerances — they're used in surgical and histology contexts — which is the kind of specification that makes the 'premium' cartridge argument look faintly embarrassing. The result is a blade that feels sharp but not aggressive, with a measured glide that suits medium-coarse hair well. Very coarse, fast-growing beards may find it dulls after three passes rather than four or five.

In practice, the Lab Blue delivers a clean, close shave with minimal irritation when paired with a mid-aggressive razor (Merkur 34C, Edwin Jagger DE89, Rockwell 6C on plate 3 or 4). Longevity sits at around three to five shaves per blade depending on hair density and prep quality — that's honest rather than aspirational. Compared to Feather Hi-Stainless, the Lab Blue is noticeably less sharp but also meaningfully less likely to remind you of that fact with a nick under the jaw. Compared to Derby Extra, it's sharper and smoother. It's broadly competitive with Astra Superior Platinum, which is the other blade everyone recommends to people who've just bought their first DE razor — the difference is marginal enough that whichever you can source cheaper is the correct answer. Gillette Silver Blue users may find the Lab Blue slightly less refined; that's a fair criticism and not one worth arguing with.

The cost calculation is the point at which the Lab Blue becomes almost embarrassing to review in good conscience: a 100-blade tuck costs roughly £8 to £12 depending on source, which is somewhere between 8p and 12p per blade. A three-to-five shave lifespan puts the cost per shave at 2p to 4p. A single Gillette Fusion cartridge retails for approximately £3.50 and lasts the same number of shaves. The Lab Blue is therefore around 99% cheaper per shave. This is not a humble-brag about frugality — it's just maths, and the maths is humiliating for anyone still defending the cartridge ecosystem. The performance is not 99% worse. It is, if anything, marginally better for skin texture over time, since single-blade shaving reduces the multi-pass tearing that causes ingrown hairs and chronic irritation.

Jamie's verdict: the Lab Blue is a genuine-lever product in the most literal sense — it does exactly what it's supposed to do, costs essentially nothing, and improves your shave without requiring you to read forty Reddit threads about blade geography. It's not the sharpest blade available, it won't transform your jawline into anything the looksmaxxing algorithm would recognise, and the packaging looks like something from a hospital supply room. That last point is, in context, a recommendation. Buy a hundred, stack them in a drawer, and stop thinking about it for two years.