Stunning invisible blue glycol-free, non-toxic concentrate for water. Ideal for stain-free leak detection, PC cooling systems, water lamps, special effects, water fountains and water curtains. Not suitable for aquaria and not suitable for ingestion. Available as a super concentrate in 50ml bottles. Mix rate guide from 1:500 up to 1:2500 depending on intensity required. Check the video link for a visual demonstration.