This masking fluid is a light blue colour to see where you have applied it. Comes in a 45ml jar. Made with natural latex, in France. Removable liquid frisquet for masking in watercolour & air brush art works. Dilutes & cleans with water. To protect your brush, first wash with soap, then wipe without rinsing, before applying the drawing-gum. Let dry, then paint and then let your painting fully dry before removing with your finger or rubber cement pick up tool.