How to Become a Spy by British Special Operations Executive

Author:British Special Operations Executive
Language: eng
Format: epub
Publisher: Skyhorse Publishing
Published: 2014-12-31T16:00:00+00:00

Lead acetate 1% Ammonium sulphide 5% Good. Ammonium sulphide hard to obtain

Sulphuric Acid. Very dilute. Heat Poor.

Chalk Few grains dissolved in acetic acid (White vinegar). Iron until paper begins to turn yellow. Bathe in .5% silver nitrate. Iron again. Very good but difficult development.

Sugar 1% Heat. Bad.

Urine. U.V. Dilute. Heat Bad.

Sulphates )

(Magnesium )1%

Epsom Salts. )

)

Wash paper in 1% lead acetate. Wash in running water. )

) Good but

) difficult to

) obtain ammonium

Zinc sulphate )

Calcium Sulphate )

(Plaster of Paris) )

Sodium Sulphate )

(Glauber Salts) )

Immerse in 5% ammonium sulphide. ) sulphide.

)

)

)

)

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