LIQUID MARKING DYE AND FOAM MARKER COLOURING AGENT Spray Marking: Suitable for use with both liquid and powder herbicide products and can be used to help identify sprayed areas. Foam Marker Dye: Where a coloured foam is required for foam markers, add at the time recommended rate to dilute foam mixture. Product Type: Dye Active Ingredient: 150 g/L Rhodamine Formulation: Soluble Concentrate (SC)