There are two methods of Shitaji forming. One is called “Honkataji” and the other is called “Shibushitaji”. In both methods, pieces of cloth are applied to the weak parts that might easily split to reinforce the woods.
In the “Honkataji” method, a material made by mixing raw lacquer, adhesive made of rice and ji-no-ko powder is applied in layers.
“Shibushitaji” method is the traditional shitaji forming method in Echizen lacquerware and is used for the Marumono lacquerware.
A material made by mixing astringent persimmon juice called “Kakishibu” and “ji-sumi-ko” powder is applied in layers.
Both lacquer and kakishibu harden after they are dried, and by repeating the applying and smoothening processes, durability is enhanced in the lacquerware.
A material made by mixing raw lacquer, adhesive made of rice and ji-no-ko powder is applied in layers by using a spatula or brush. In the first coating, rough powder of ji-no-ko is used and fine powder of ji-no-ko is used in the second coating.
In the picture, the brown material is the mixture of raw lacquer and adhesive made of rice and the gray material is the ji-no-ko powder.
Shibushitaji A material made by mixing kakishibu (astringent persimmon juice), ji-sumi-ko (charcoal powder) and soot of burnt pine is applied in layers. When applying, a wheel called rokuro is used to apply the material while spinning a round shaped bowl. Then, the wood base is smoothened by using a rubbing stone.