applicator set, applicator set, cleaning degree determination method, and cleaning degree determination system

摘要

summary? applicator, applicator set, method of determining the degree of cleanliness, and system of determining the degree of cleanliness? an applicator; a set of applicators; a method for determining the cleanliness of a surface using the applicator or applicator set; and a system for determining the cleanliness of a surface comprising the applicator or applicator assembly. The applicator may include a marker composition and an applicator body capable of retaining the marker composition. The marker composition may include retroreflective particles and a dispersion medium, with the mixing ratio of the retroreflective particles being 50 to 90% by weight based on the total marker composition.