A microchemical system is provided, which can improve the working efficiency of the user and can be designed compact in size. The suppressing member is provided in the neighborhood of the sheet introducing opening so as to block diffusion between the casing and the first rotatable member. The present invention is also directed to a detergent-dispersant additive composition comprising a Group II metal overbased sulfurized alkylphenols, wherein the Group II metal overbased sulfurized alkylphenols have a reduced color as measured by ASTM Test No. Furthermore, the ink in the second measuring pipe 52 is mixed into a mixing tank 34 with ink previously supplied to the mixing tank 34 from the main tank 31. The fabric has a contact thermal protective performance value of at least 4.