Fluorescein

Fluorescein – Simple, Bright Fluorescent Tracer Dye

Fluorescein is a bright yellow-green dye that helps people see the movement of liquids. It’s used in leak detection, water tracing, and medical testing. Under UV light, it glows clearly, making it easy to track where water or fluid goes. It’s often used in water treatment, environmental checks, and some medical tests around Australia.

Because it’s easy to see and low in toxicity, Fluorescein is a popular choice when you need to follow water flow or check for leaks.

What is it?

Fluorescein is an organic compound (CₒH₁₂O₅). Most people use it as Sodium Fluorescein, which comes as an orange-red powder. It dissolves in water and glows a yellow-green colour under UV light. Typical use is between 1% and 5% strength depending on the job.

In medicine, doctors use it to check eye health and blood flow. In environmental work, it’s used to trace rivers, groundwater, and spills.

Common Uses

It works well as a tracer dye in industries like:

• Leak detection: It shows leaks in pipes and tanks with a clear colour trail.

• Boiler systems: It helps check flow and leaks without messing with water chemistry.

• Groundwater testing: It tracks water movement and helps spot pollution.

• Medical checks: Eye doctors use it to get clear pictures of the eye.

It’s also used in research and for checking corrosion inhibitors.

Product Details

• CAS Number: 2321-07-5

• Appearance: Orange-red powder

• Smell: No smell

• Solubility: Mixes well in water, glows yellow-green under UV

• pH (1% solution): About 5 to 7

• Stability: Stores well if kept dry and out of light

• Safety: Low-toxicity at normal use levels, but use gloves and goggles

Handling and Storage

Wear gloves, goggles, and a mask when using Fluorescein. It’s safe, but you don’t want dust on your skin or in your lungs. Keep it in a cool, dry place, away from strong chemicals. Use a sealed, dark container to stop light from affecting it.

Need Fluorescein?

We supply Fluorescein across Australia in small packs or bulk. You can pick it up or have it delivered. For orders or questions, contact us.