Writing instrument for water-metachromatic members with detachable pen point holder

Abstract

A writing instrument for a water-metachromatic member has a cylindrical container capable of holding water, formed with an opening at a tip end thereof to communicate the interior of the container with the exterior thereof, a hollow cylindrical holder which directly holds a pen point member, being formed at a tip end with an opening through which the tip end of said pen point member is projected outwardly and at a rear end with a communication hole, and a gap provided between an inner peripheral surface of the cylindrical holder and an outer peripheral surface of the rod-like body to form a gap for generating a capillary force therebetween. When the holder is held to the container, water is supplied through said communication hole to said pen point member. When the holder is detached from the container, the opening of the container is usable for water supply.

1 - 11 . (canceled)  
   
   
       12 . A writing instrument for water-metachromatic member with which writing instrument any desired writing image is formed by means of water on a water-metachromatic member comprising a support and provided on the surface thereof a porous layer formed of a binder resin to which fine-particle silicic acid stands fixed dispersedly, and capable of rendering different transparency between a liquid-absorbed state and a liquid-unabsorbed state; 
 said writing instrument comprising a main body, a pen point attached to the front end of the main body, and a water absorber held in the interior of the main body;    the front end of said water absorber being connected to the rear end of the pen point so that said water absorber is internally suppliable with the water by absorption; and    said main body being provided at the rear end thereof with a communicating hole through which the rear end of said water absorber communicates with the outside.    
   
   
       13 . The writing instrument for water-metachromatic member according to  claim 12 , wherein said water absorber is so constructed as to be internally suppliable with water by absorption from the pen point.  
   
   
       14 . The writing instrument for water-metachromatic member according to  claim 12 , wherein said water absorber is so constructed as to be internally suppliable with water by absorption through the communicating hole at the rear of said main body.  
   
   
       15 . The writing instrument for water-metachromatic member according to  claim 12 , wherein said communicating hole at the rear of the main body is made open outside at a position rearward to the rear end of said water absorber.  
   
   
       16 . The writing instrument for water-metachromatic member according to  claim 12 , wherein a communicating hole through which the front end of said water absorber communicates with the outside is provided at the front portion of said main body.  
   
   
       17 . The writing instrument for water-metachromatic member according to  claim 12 , wherein said pen point and said water absorber each comprises a fibrous worked member or a synthetic resin porous member, and said pen point has a capillary force set greater than the capillary force of said water absorber.  
   
   
       18 . The writing instrument for water-metachromatic member according to  claim 12 , wherein a tail stopper is fixed to the rear-end opening of said main body, and said communicating hole is provided in the tail stopper.