Last Friday, Sir Chan did the Paraffin Casting and yesterday Mam Vicky performed the paraffin test. Together with Faye and Mark who had just reported, we observed how Mam Vicky did the test. She put Diphenylamine or commonly known as Lange's Reagent to the cast. If it is positive of gun powder nitrates, a blue color will appear from the bottom and will continue to grow bigger. Sometimes there are blue dots that would appear, but if it didn't come out from the bottom, so it is not gun powder nitrates. It could be a contamination because nitrate can also be present in other like the soil.
The paraffin test can be performed only within 72 hours from the time that person fired the gun because after 72 hours the nitrates might already be blown away by the wind or other factors. They don't also perform paraffin test to a person who was already embalmed because the pores of the skin will no longer open so it you put a hot wax for the nitrate to evaporate it will just stick to the wax.
posted by:
Isabelle Melinette M. Gucor
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