PURPOSE: To achieve immediately, directly, clearly and precisely a state of molding even if the operator is not a skilled technician, by making use of a tablet where sections provided repeatedly at fixed intervals are colored in separate colors.

CONSTITUTION: A polyethylene tablet 11 premolded in high quality is cut into round slices, red and black paints are applied thin to a circular section in a semicircular form at every 90 degrees, the slices are piled upon one another so that a color division is not slid and confronting two positions on the outer circumference are fixed by performing easily thermal welding. The tablet 11 is used for constitution of a mold type, transfer molding is performed by injection through a gate part of a head part of molding 3 and a colored state at a principal section XX-ZZ of a molding 3 with the final mold is examined. In the case where any of the section is colored intermittently with the red and black in the semicircular form at every 90 degrees and the same is in almost similar figures with the color of the section 21 of the tablet 11, with this construction, molding is performed uniformly and in axis symmetry.