Spray Indicator Dye, Food Grade Blue, 1 Litre, for Knapsack and Boom Sprayers

When you spray a clear liquid across a path, lawn or paddock, it is hard to see where you have been. Spray indicator dye solves that. This is a food grade blue dye mixed into the spray tank with your herbicide, pesticide, fungicide, insecticide, moss killer or liquid fertiliser. It temporarily colours the treated area blue, so you can see exactly what has been covered. You avoid missed strips and double doses, which wastes product and can damage plants. It comes in a 1 litre bottle and can be used all year round. Groundskeepers, sports turf managers, landscapers, farmers, spraying contractors and council teams use it with knapsack and boom sprayers.

Why it works

See every pass

Clear sprays dry invisible within minutes. A blue marker shows the edge of each pass, so you can line up the next one without gaps or overlaps. That improves accuracy on large areas, awkward shapes and hard surfaces with weeds in the joints.

Temporary by design

The supplier states the treated area stays blue for a few days, depending on the surface. It then fades in sunlight or washes away with rain, so lawns and paths return to normal on their own.

Works with most liquid treatments

The dye is mixed straight into the spray tank. The supplier lists use with liquid herbicides, pesticides, fungicides, insecticides, moss killers and liquid fertilisers.

Small dose, big coverage

Through a boom sprayer, the supplier's rate is 1 to 2 litres per hectare, so one bottle covers up to 10,000m² at the lower rate. In a knapsack sprayer, use 12.5ml to 30ml per 10 litres of water. Use up to 50ml on surfaces where a stronger colour is needed.

Where it's used

• Hard surfaces, paths, driveways and car parks
• Lawns, sports turf and amenity grass
• Paddocks and pasture
• Around trees, shrubs and ornamentals
• Artificial surfaces

Specifications

Choosing the right option

This listing is a single 1 litre bottle. The choice is how many bottles your season needs.

For knapsack spraying, one litre makes between about 330 and 800 litres of spray mix at 12.5ml to 30ml per 10 litres. That is 20 to 50 fills of a 16 litre knapsack. Use the lower rate on lawns and grass, where blue shows clearly. Use the higher rate on dark tarmac or block paving.

For boom spraying, allow 1 to 2 litres per hectare. A sports field or paddock of about one hectare needs one or two bottles per application.

Installation, use & care

Always read the product label before use, and the label of the product you are mixing it with. Half fill the sprayer with water, add the main product and the dye at the stated rate, then top up and mix. Wear gloves, as the dye can stain skin. Keep it off surfaces you do not want temporarily coloured, such as render, timber or clothing. Store the bottle sealed, upright and out of reach of children.

FAQ

Will it stain my patio permanently?

The supplier states it stays blue for a few days, then fades with sunlight or washes away with rain. How long it lasts depends on the surface.

Is it harmful to grass?

The supplier lists it for lawns, sports turf, new grass, paddocks and pasture, and describes it as non-toxic.

Can I use it with fertiliser?

Yes. The supplier lists liquid fertilisers among the products it can be mixed with.

Do I need gloves?

Yes. Wear gloves, as it can stain skin.

Ordering & delivery

Sold as single 1 litre bottles, priced per bottle. A minimum order of 4 bottles applies, shown when you add to basket. Delivery charges and lead times are shown at checkout.