DIY Craft Supplies: Make Your Own Alcohol Inks - FeltMagnet
Turf Mark Blue Liquid Concentrate
Red Spray Marker Dye
DIY Spray inks {& Shimmers} and Ink Daubers! – The Frugal Crafter Blog
How to make DIY Spray Inks in any color! - Dreams Factory
Yates 500ml Liquid Easy See Spray Dye - Bunnings Australia
Amazon.com : Blue Spray Indicator - Dye for Weed Spraying - Mark Where You've Sprayed with Blue Dye - Safe & Non-Permanent Dye with Pipette for Easy Mixing - 8oz : Patio,
Dye Marker For Weed Spraying | Herbicide Dye Markers