Master Stone
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At KUROKI GOISHI TEN we have < the Master Stone > which
forms the basis of our own product standars.
When producing Go Stones, the Master Stone is used in every stage of the process.
First of all, our craftsman and sorting staff should acquire knowledge about the Master Stone, and even experts must not neglect to check it everyday throughout the process.
Any stone which is not the same as the Master Stone, lacks stability, or has a shape that doesn't suit the hands will be strictly removed as not suitable.
A stone that meets the criterion has well balanced roundness according to its size, a nice smooth surface wich fits in the hands, a beautiful side line with no damage, and a perfect shape to fully satisfy the player's eyes, ears, and fingers.
Sub-standerd Stone
We at KUROKI GOISHI TEN carefully examine Go Stones one by one. The following stones listed must be removed from the regular merchandise.
◆thin sideline
Go Stones with a thin sideline ( less than 1mm ) or with no sideline tend to chip easily.
◆soroban shape
The soroban ( abacus ) shaped Go Stones are unstable and tend to damage Go Boards.
◆projection of the sideline
Go Stones with projection in the side line tend to be discolored easily with fingermarks, and are also unattractive and feel rough.
◆thich sideline
Go Stones with a thick sideline are bad looking, feel rough and don't fit in to the hands.
◆Dango (dumpling) shape
Characteristically, Go Stone should rock on the board a little, but when the shape is this round, it doesn't rock at all.
◆protruding sideline
Go Stones with a protruding sideline tend to chip easily and feel rough.
◆bad-balanced sideline
Go Stones with a sideline that doesn't run parallel tend to chip easily and are not nice to look at.
◆bad-balanced roundness
When the upper side and lower side aren't equally balanced, Go Stones are unpleasant to touch, unattractive, and unstable.
◆flat-top shape
When the top is flat, a Go Stone becomes unpleasant to touch, may easilly be discolored with finger marks, is unattractive, and doesn't rock at all.
◆groove in the sideline
Go Stones with a groove in the side line become dirty, and chip easilly.
