Official Seals Act Article 3
The material and form of official seals shall be as follows:1. Material: National seals shall be made of jade; permanent organization seals of the President and the five Yuans shall be made of silver; office seals of the President, Vice President, and five Yuan presidents shall be made of ivory or silver; other permanent organization seals, temporary/special organization seals, and office seals shall be made of copper. However, wood or aluminum may be used temporarily to adapt seals to local conditions, and horn may be used temporarily to make office seals; name seals shall be made of wood.2. Form: National seals shall be square in shape with the national emblem engraved on top of the knob; permanent organization seals and office seals shall be square in shape with a straight handle; temporary/special organization seals and name seals shall be rectangle in shape with a straight handle. However, office seals made of ivory shall be in the shape of a square cylinder.The characters on official seals listed in subparagraphs 1 to 5 of the preceding article shall be zhuan script cut in relief.
中文原文 印信條例第3條
印信之質料及形式，規定如下：
一、質料：國璽用玉質；總統及五院之印用銀質；總統、副總統及五院院長職章，用牙質或銀質；其他之印、關防、職章均用銅質。
但得適應當地情形，暫用木質或鋁質，並得以角質暫製職章；圖記用木質。
二、形式：國璽為正方形，國徽鈕；印、職章均為直柄式正方形；關防、圖記均為直柄式長方形。
但牙質職章為立體式正方形。
前條第一款至第五款之印信字體，均用陽文篆字。
一、質料：國璽用玉質；總統及五院之印用銀質；總統、副總統及五院院長職章，用牙質或銀質；其他之印、關防、職章均用銅質。
但得適應當地情形，暫用木質或鋁質，並得以角質暫製職章；圖記用木質。
二、形式：國璽為正方形，國徽鈕；印、職章均為直柄式正方形；關防、圖記均為直柄式長方形。
但牙質職章為立體式正方形。
前條第一款至第五款之印信字體，均用陽文篆字。