PROBLEM TO BE SOLVED: To provide a technology capable of smoothly and effectively making a pigment out of a soluble coloring agent precursor existing in a solid resin, etc. SOLUTION: This composition for coloring comprises a soluble coloring agent precursor (i) having at least an NH group and...
PURPOSE: To provide an excavating method of a shield excavating machine reducing the reactive force. ;CONSTITUTION: A shield excavating machine is provided with a shield excavating machine body 1 arranged in an excavated tunnel and a cutter 2 positioned at the front side. In this excavating method...