Collect all papers found on a crime scene, even if you cannot see any prints.
Cover the document and vacuum plate
with the clear Type IW plastic film.
Switch on the vacuum pump and smooth the plastic film with a cotton ball to eliminate all wrinkles and air gaps.
Charge the plastic film with the Corona unit
for 10 to 15 seconds.
Use a fingerprint brush and the developing powder to develop the indented writing traces.
Apply the powder to the plastic film just as if you were dusting for latent fingerprints.
Brush gently back and forth and you will see the image appear. Brush as necessary to develop each word.
To save the image, cover it with a piece of
the adhesive film.
For good adhesion, rub the surface with a piece of cotton wool.
Remove the adhesive film from the IW plastic film.
There will be no damage to the original document.