What sets Tasai apart
Tasai's reputation rests on three things: their proprietary 'Blue Steel 1.5' alloy (between Aogami #1 and #2 in carbon content, worked to a specific hardness window), an extremely deep ura hollow ground with exceptional flatness, and finishing that arrives essentially ready to use with minimal preparation. Both Akio Tasai (founder) and his son Michio are certified Japanese Traditional Craftsmen — one of fewer than 100 smiths in Japan to hold this designation.
The Blue Steel 1.5 difference
The 'Blue Steel 1.5' is not a Hitachi catalog steel but a proprietary variant worked and heat-treated specifically for Tasai's specifications. It achieves the edge retention of Aogami #1 with slightly improved sharpening ease — the steel's characteristics sit in a sweet spot that Akio Tasai developed over decades. Tools made with this steel are identifiable by specific stamps; counterfeit Tasai tools exist in the market, typically using lower-quality steel.
New vs second-hand
Authentic Tasai tools are available new through reputable importers (Tools From Japan, Fine Tools) at significant but fair prices. The second-hand market for Tasai is active internationally — Japanese auction sites (Yahoo! Japan Auctions, Mercari) frequently list used examples at lower prices. Verify authenticity by examining the stamp closely: the genuine stamp is crisp, deep, and uses specific kanji forms documented in collector references.
Preparation
Even Tasai chisels require preparation before first use. Remove the lacquer coat from the blade body with mineral spirits or acetone; it protects the steel during storage but interferes with sharpening. The ura may need a single light pass on a 1000-grit stone to confirm flatness. The bevel should be lightly honed to remove the protective micro-bevel applied at the workshop. First use preparation for Tasai takes 15–30 minutes — far less than most Japanese chisels.
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