PURPOSE:To evaluate the change of dye tones and to check the thoroughness of a plasma treatment by disposing a sample piece which has a porous surface and is stuck with an indophenol dye in said pores together with the surface of a base material to be subjected to the plasma treatment and subjecting the base material and sample piece to plasma treatment. CONSTITUTION:The plastic base material is subjected to the plasma treatment prior to painting to said material in order to assure the adhesiveness between said base material and the coated film by painting. The sample piece which has the porous surface and is stuck with the indophenol dye in said dyes is disposed together with the surface of the base material to be subjected to the plasma treatment and the plasma treatment is executed, then the change of the color tones of the dye after the treatment is evaluated. Namely, the thoroughness of the plasma treatment can be checked by the way how the changes take place. The sample piece obviates the splashing of the material sticking thereon on progressing of the plasma treatment and has the larger area to be subjected to the plasma treatment than in the case of sticking the material to the smooth plastic base material. The change of the color tones is thus increased and the change thereof is easily checkable.
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