Features: Cover the area that needs to be protected when used in large-area watercolor layers. Dilute the masking fluid with water to a watery consistency, which is easier to mask or erase. This masking fluid produces excellent results when removed as soon as possible after application. The areas applied with the fluid need to dry before overpainting. Once dry, these areas remain protected and cannot be penetrated by colour. The dark color at the bottom is a precipitate, which is a normal phenomenon. Specification: Item Name: Art Masking Fluid Application: Watercolor Painting Volume: 18mL/75mL (Optional) Package List:1 x Art Masking Fluid Notes: 1-2cm error might exist due to manual measurements, please kindly understand. The colors deviation might differ due to different monitor settings. We provide you with the best product and service. If you have any problem, please let us know, and we will solve the problem ASAP. Thank you so much.