Mizutani Scissors Black-Smith Solid LEFTY
The Black-Smith Solid LEFTY is the result of an analysis done by two professors who specialized in Ergonomics and Metal Engineering, respectively. The center of gravity in this model has been shifted closer to the hand to prevent wobbling during cutting, while a unique hardening process based on thorough temperature management brings out the special characteristics of the materials making this a perfect all-around scissor. For barbering, we recommend 6.5 and 7.0.
A collaboration of these wild guys and professors!
Extramarise® (registered trademark), is a proprietary heat treatment process* ideally suited to haircutting scissors, developed by Mizutani using data and experience accumulated over a period of more than 90 years to balance the three required properties for a good blade: structure, blade angle, and hardness.
The metals used for edged tools change a great deal depending on the heat treatment used. Proper heat treatment for each material must be carried out in order to fully draw out the properties of rare metals within it, such as cobalt, molybdenum, and vanadium.
Perhaps you’ve heard the term “heat tempering” before. The metals used for scissors don’t initally have sufficient hardness for this use. The stainless steel used in scissors is first heated to over 1000°C, then rapidly cooled to achieve the required hardness. This process is called “hardening.” (For Stellite and other cobalt alloys, different temperatures may be used.) Also, with only hardening, the metals are hard enough, but extremely brittle, so they undergo a “tempering” process to achieve greater durability. For even higher quality edged tools, a further treatment called “sub-zero processing” subjects the metals to a temperature of -100°C or below using materials such as liquid nitrogen in between hardening and tempering to prevent structures that have not completely undergone martensitic transformations (retained austenite) from causing deformations in the course of use (changes occurring over the course of several years).
“Hardening,” “tempering,” and “sub-zero processing” can be combined in an infinite number of ways, and carrying out the ideal combination for high-grade materials to bring out their latent properties to the greatest extent requires an abundance of knowledge and experience. Through the Extramarise® process, developed at Mizutani through analysis of massive volumes of data and experience, we provide metals which leverage the materials of their constituent elements effectively.
Yoshiyuki Ueno, Doctor of Engineering
Research Fields : Measurement of human bodies and movements, physiological measurement; ergonomic design for chairs, seats, beds; ergonomic design for sink areas for kitchens and bathrooms; ergonomic design for writing materials and other tools; etc.
Publications : “Building a School Bathroom Together: Removing the Barriers in Our Hearts” (School Toilet Research Society), “Illustrated Ergonomics” (Japanese Standards Association), “Interior Planning and Design” (Shokokusha)
Dr. Kentaro Asakura, Engineering
Publications (Separate Volumes) : Talking about Microscopes and Talking about Non-Woven Fabrics (Japanese Standards Association), 5-volume microscope series including Macro Observation and New Microscope Q&A and All About Edged Tools (Agne Gijutsu Center).
EXTRAMARISE® is a proprietary heat treatment ideally suited for haircutting scissors that was developed by MIZUTANI based on long years of accumulated data and experience. The same steel material can have totally different performance depending on the heat treatment used. Therefore, to maximize the special qualities of the rare metals (cobalt, molybdenum, vanadium, etc.) we’ve added to our products to the greatest extent possible, and achieve the ideal metal for scissors, (*hardening, tempering, sub-zero processing) and other complete temperature management procedures are essential. To bring out the distinct characteristics of materials, and manufacture a blade with the ultimate strength required for haircutting scissors, we at MIZUTANI have implemented our own proprietary heat treatment using the ideal temperature for scissors: EXTRAMARISE® processing.
THRUST BALL BEARING
These are small, precision metal ball bearings with excellent axial load-bearing ability. Due to their design, which enables radial load-bearing as well, scissors open and close smoothly, which both lessens burden on the hands and contributes to a long cutting life. With anti-rust properties and durability as a matter of course, these bearings are a Japanese-made product.
The handles are so designed that they look nonmetallic, alive and organic. You may feel some warmth from the three-dimensional, twisted handles, and once touched, you would not like to part them from your hand.
Compact and easy to turn, this is a flat type driver for UFO screws. This screwdriver is included with all scissors with the mark shown.