Samples of ignition control additives for petrol engines by Associated Octel, c.1970. (two sets of sealed glass ampoules) 1. Lead 2. Sodium 3. Lead/sodium alloy 4. ntrated sulphuric acid 5. Potassium permanganate solution. 6. Sodium hydroxide pellets 7. Sulphuryl chloride 8. Ethyl chloride 9. Ethane (gas) 10. Ethylene (gas) 11. Chlorine (gas) 12. Ethylene dichloride (1,2 - dichloroethane) 13. Bromine (gas/liquid) 14. Ethylene dibromide (1,2 - dibromoethane) 15. Kerosene 16. Tetraethyl lead (lead tetraethyl) 17. Octel Blue. 18. Octel Orange