Blue Dye Spray Indicator


Temporarily Stain The Treated Area To Avoid Missing Or Overdosing

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Blue-gem ® is a food-grade blue dye that is mixed in the spray tank with herbicides and pesticides to help improve accuracy. An integral part of spraying, Blue-gem will identify the sprayed area by temporarily dying the area. The treated area stays blue for a few days after application (how long it remains will depend on the surface) and then fades with sunlight or washes away with rain.

Using a spray indicator, such as Blue-gem, will in turn save you money and time as you are not missing any areas or overdosing any areas by spraying more than once. It can be used in a knapsack or boom sprayer and is compatible with herbicides, fungicides, insecticides, moss killers and liquid fertilisers.

To use; half fill the spray tank with clean water, agitate the water and add the required amount of blue gem. Then add the pesticide or other treatment(s) and then fill the tank with water to the desired level and commence spraying.


Key Benefits:

– Safe for mixing with liquid herbicides and pesticides.

– The dye is temporary- washes away with rain and faded by sunlight.

– Saves money as overdosing is reduced.

– Saves time as areas are less likely to be missed.

– Non-toxic


Our Recommendation:

– Always read the product label before use.

– Avoid getting the product on areas you do not want temporarily dyed.

– Mix in with herbicides so you can clearly see the area you have sprayed.

– Wear Gloves to avoid stained skin.

Dilution Rates

125 to 300ml per litre of water

Safe Use of Pesticides

By law, everyone who uses pesticides professionally must have received adequate training in using pesticides safely and be skilled in the job they are carrying out.” Upon purchasing this product you and/or the end-users are responsible for ensuring that these products are used in line with industry Approved Codes of Practice.

All operators must be trained and certificated in using and applying any Ministry Approved Professional Product (MAPP). Use plant protection products safely. Always read the label and product information before use.

Please be aware that by proceeding you are purchasing a professional pesticide product. You must ensure the end-user of these products complies with the DEFRA/HSE Code for the Safe use of Pesticides.

There are legal responsibilities covering the storage and use of professional use pesticides. These responsibilities are covered by The Food and Environment Protection Act 1985 (FEPA) and Control of Pesticide Regulations 1986 (COPR).