Suruga-zumi is a finely calibrated Japanese charcoal , originating from the Suruga region (present-day Shizuoka prefecture).
 Appreciated for its balanced texture , neither too abrasive nor too soft, it is ideal for intermediate polishing stages in lacquer, metal or wood work.


 This charcoal helps to refine the surface , correct the micro-irregularities left by the Hō-zumi and prepare the material to receive the glossy finish.
 It produces a smooth, satin finish , perfect before the final polishing with Roiro-zumi .

 Features and uses :

 
 More abrasive than Hōh-zumi, it prepares the surface before delicate finishing touches.
 
 It helps to eliminate minor irregularities and even out the worked areas.
 
 An essential step before polishing with Hōh-zumi (soft finish) and Roiro-zumi (mirror effect)


 Suruga-Zumi thus constitutes an indispensable intermediate step to obtain perfectly prepared surfaces and high-quality finishes in kintsugi and Japanese lacquer.