Grimm's recently delivered items here
Free Shipping over ÂŁ50.
Standard delivery from ÂŁ3.80.
60 day returns period.
For more options including Click & Collect from Forest Row, see shipping and returns
10g of fluorescein salt powder in a vial. This red powder is a dye that turns an intense yellow-green when mixed with water. Fluorescein was first made in 1871 and it has since found use in many niche applications thanks to its unique colouring properties and ultraviolet fluorescence. It is commonly used as a medical dye to detect and diagnose various eye injuries and also to trace the flow of streams, groundwater, and glacier water. When mixing with water, a tiny amount goes a long way.
This vial should be enough to dye at least 100 gallons of water. It is organic and harmless to the environment at these low concentrations. The fluorescein reaction is pH-dependent. Once it has reacted in water, the color can be altered by changing the acidity of the water. Even though fluorescein is commonly used in medical applications, please do not consume it.
Diameter: 2.5"
From United States of America
*Please Note: This is not a toy & requires adult supervision
Science KitsOverall rating: 4.5 / 5 from 2 reviews.
Review topics: ["pigments"].
"I painted with it, which was just the right pigment at the right time. I loved the pigments then floating in the water, the iridescence and luminosity of it. I would have just wanted a bit more information of the source of the pigment, though you have already good information on the label."
"This is one of those brilliant things for older children that Conscious Craft are so good at finding. Recommended!"
Children instinctively create and live in an imaginative world. We bring that to life here at Conscious Craft by offering you the best natural toys and craft materials we can find. We believe that giving children the right materials, they will make and play with beautiful things that last a lifetime.
Customers who bought these items also bought