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Union of India - Section
Section 220 in The Explosives Rules, 2008
220. cubic centimetres of freshly distilled water are to be placed in a Jena glass flask and raised to boiling point over a spirit lamp burning pure spirit. 3 gram of the starch, prepared as above, are to be suspended in 30 cubic centimetre of distilled water and the mixture poured into the 220 cubic centimetres of boiling water, with continuous shaking. The whole is to be kept boiling gently, and shaken occasionally for 5 minutes. The solution of starch so prepared is to be added to a solution of 1 gramme of the purified potassium iodide in 250 cubic centimetre of freshly distilled water, and the solution well mixed. The mixture is to stand overnight in a dark room. The following day, the clear supernatant liquid is to be carefully siphoned off and used immediately for dipping the paper.
If it is desired to dip a large batch of paper, the foregoing quantities may be multiplied in order to obtain sufficient solution.Dipping the papers:The clear potassium iodide and starch solution is to be poured into a porcelain tray, which is to be kept exclusively for this operation. Sheets of filter paper to Specification D are to be passed through it singly, so that all except 3 centimetres at the end of the strip of paper passes beneath the surface of the liquid.The strip of paper is to be held above the tray by the dry portion and a glass rod passed down each side to remove the excess of solution. It is then to be suspended by the undippened portion in a warm dark room, cupboard, or oven until dry.It is advisable to nip a small piece, out of the edge of each sheet at the boundary line between the wet and dry portions as a guide in subsequent cutting.Cutting and Trimming the Test Paper:In cutting and trimming heat test paper the operator is to wear clean cotton gloves.When the sheets are dry they are to be trimmed by cutting off the unclipped end about 0.5 centimetre below the edge of the undipped portion, 0.5 centimetres strips are also cut from the other three edges. The sheets are then to be stored in amber coloured glass jars, kept in the dark.When a batch of paper has been passed for issue the sheets are to be cut up into rectangular pieces 1 centimetre by 2 centimetres, and are to be issued in this form.All the above operations are to be carried out in a building specially reserved for this work. This building is to be protected from the direct access of the sun's rays, and is, as far as possible, to be kept dark.TESTING OF HEAT TEST PAPER BY THE DIFFUSION TESTApparatus and Materials required:| No. | Pieces | |
| 1. | Acheson graphite, | 1 |
| 2. | Acid, Sulphuric, normal solution | Sufficient supply |
| 3. | Annulus aluminium | 2 |
| 4. | Cap, light-tightpaste board | 1 |
| 5. | Cylinder, glass, with rubber stopper | 1 |
| 6. | Cylinder, measuring 100 cubic centimetres | 1 |
| 7. | Ferrous ammonium sulphate | Sufficient supply |
| 8. | Jar, cylindrical, brown glass | 1 |
| 9. | Pipette 10 cubic centimetres | 1 |
| 10. | Rod, stirring, glass | 1 |
| 11. | Sodium nitrite solution containing 1.7 grams in 1 litre | Sufficient supply |
| 12. | Stopper, rubber, with 4 platinum hooks | 1 |