| 摘要 |
PURPOSE:To obtain a writing utensil suitable for memorizing, learning or the like by putting handwriting in colored or colorless condition in use of heat or cooling heat on the basis of a specific range of respective temperature, or by making handwriting with thermal discoloring ink for alternatively memorizing and retaining any one of respective colors in the area of a specific range of temperature. CONSTITUTION:A color-retaining thermosensitive discoloring material with discoloring characteristics takes the temperature between 0 deg.C-25 deg.C as (t1), the temperature between 5 deg.C-40 deg.C as a temperature area of the first temperature (t2) the second temperature (t3), and temperature between 25 deg.C-45 deg.C as (t4). In these temperature areas, handwriting is made such that it can be done in either colored condition or colorless condition. Also, writing is made with a thermal discoloring ink from water to oliliness containing a solidifying resin for alternatively memorizing and retaining in any condition of the color of a first color phase and color of a second color phase at a two color retaining temperature area of 5 deg.C-40 deg.C. Thus, the writing utensil can be used for memorizing, learning, message and the like. |
