Monday, 07 May 2018 18:17

What fluoresces?

 

Subject 

Colour

Colourless solution of eosin and acriflavine 

Brilliant green

Mustard made into a solution and then dried 

Green

Hen’s egg - brown fresh 

Brilliant scarlet

Quinine detected weak solutions 

Electric blue

Sodium salicylate 

Like a star

Tinea - ringworm 

Bright metallic green

Squamous cell carcinoma 

Glows like hot coals

Secretions of the skin, fingers and nails 

Delicate blue

Urine 

Pale blue

Teeth 

Bright white

Decay, plaque or false teeth  

No fluorescence

Seborrheic eczema

Dull brownish-yellow

Psoriasis (on underside of scales) 

Silver white light, (pink)

Paraffin wax + paraffin oil 

Blue

Quinine in drinks like tonic water

Blue

Fluorspar

Blue

Alcoholic solution of chlorophyll

Red

Crystalline lens of eye under suitable conditions 

Bright blue

Forensic uses include drugs e.g. Lysergic Acid (LSD) which can be detected by absorption and excretion of quite small quantities. Mineral oils fluoresce differently from vegetable oils e.g. compare mineral oil, linseed oil, paraffin, vaseline etc. using oil spots on paper. Precious stones and pearls fluoresce differently depending on their origins. Wool can be distinguished from cotton and silk.

Read 3344 times Last modified on Saturday, 29 December 2018 17:47

Leave a comment

Make sure you enter all the required information, indicated by an asterisk (*). HTML code is not allowed.