Incendiary mixture: Potassium chlorate, sulphur, ground coal or sugar, iron filling and wax.

Description: This device is a skillful imitiation of a standard, glazed building brick to which it is comparable in size, weight, and appearance. The brick is wax coated with paint to give it a realistic finish and so allow it to be carried about with-out detection. There is no pocket for insertion of an igniter.

Operation: The incendiary brick is ignited in various ways, all of which are alike in prin-ciple. One method is to pour sulphuric acid and glycerine into a thin rubber tube which is weakened at one point to allow the acid to burn through quickly. When the acid burn through the tube, it drips onto a small amount of potassium permangenate which ignites the brick.

Figure 199 – Incendiary Brick.