Fluorescein
Powder
25
grams, 50 grams, 100 grams, 200 grams
Name: Fluorescein
powder, Fluorescent dye, Fluorescein
sodium salt
Synonyms: Acid Yellow 73, NaFl,
NaFluo, Sodium fluorescein, Uranine
Physical Form: Orange/orange
powder
Concentration:
200% ± 5% (relative to standard)
Shade:
∆E ≤ 1.0
-0.2
≤ ∆L ≤ 0.5
-0.5
≤ ∆C ≤ 0.5
Solubility in water: (100ºC) ≥ 10 g/l
Chemical formula: C20H12O5
Due to its
very high colour yield and selective colour, the dye is primarily used for
marking water in heating circuits to detect leaks, as well as for colouring
household chemical products. After application, it gives a yellow-greenish
colour. Due to its good solubility in water, it can be used to colour household
products such as cleaning products, detergents, toilet blocks, etc. The standard consumption of dye for
colouring water in heating circuits is 10 - 20 g/m3 depending on the needs.
It is an organic chemical compound, a xanthene
derivative which is a xanthene dye. In alkaline solutions, fluorescein shows a
green-yellow fluorescence, visible even at dilutions as low as one to tens of
millions. The sodium salt of fluorescein is called uranine or acid yellow.
How is the dye
produced?
Fluorescein is obtained by heating phthalic anhydride
with resorcinol in the presence of a catalyst e.g. (zinc chloride, ZnCl2):
A derivative of fluorescein in the form of a leuco-dye
is used in forensic science, for the fluorescent detection of the presence of
blood at a crime scene.
A chemical organic compound, xanthene derivative,
synthetic dye, orange-red crystalline substance, insoluble in water; its
water-soluble sodium salt, uranine, exhibits intense green fluorescence,
visible even at a dilution of 1 : 40 million (during World War II, it was
supplied to aircraft operating over the seas - it made it easier to find
survivors).
And now I present to you 10
examples of applications of Fluorescein powder:
1. Tests
in medicine, e.g. to assess blood flow in the eye
2. Fluorescent
staining of tissue for histological examinations
3. Testing
of weld seams in plumbing systems
4. As
a dye in the production of UV paints and varnishes
5. As
a dye in the manufacture of UV printing inks
6. For
determining the flow rate of liquids in the chemical industry
7. For
leak detection in sewage systems
8. As
a tracer in metallurgical tests
9. In
biochemical research, e.g. pH determination in cells
10. In
optics, e.g. for testing the quality of contact lenses
Shipping:
1. All items
are in stock and are usually dispatched within the same day (for orders
received before 9.00 am Monday to Friday) or within 24 hours subject to
availability. Please note that items purchased on weekends and bank holidays
are dispatched the next working day.
2. All UK
orders are sent via Royal Mail 2nd Class and usually arrive within 2-3 days
3. Orders over
£50 are sent via UPS next-day tracked
Welcome everyone to our store.
And if you have already purchased a product in our store and you are satisfied,
please leave a positive comment. This will allow us to
develop and expand our horizons.
If you have any questions, please ask, we are
here for you.