A writing instrument comprising a smooth elongate case has a recessed switch for extending and retracting the tip of an ink cartridge. The assembly has a seal-forming material with a glass matrix phase and a crystalline phase. The electronic interface facilitates the registration of the item by associating the set of environmental conservation properties to the item. and in the presence of a catalyst such that the isocyanate groups form carbodiimides for forming uretonimine and uretonimine oligomers. The contact lenses are horizontally supported in the hydrogen peroxide solution on a bottom surface of a lens containing portion which opens upward, and a contact preventing member which prevents the contact lenses from coming into contact with the metal catalyst is provided between the metal catalyst and the lens containing portion.