Rinse with a solution of permanganate of potassium, followed by diluted sulphuric acid. In many cases a solution of chlorinated lime or chlorinated soda will answer the same purpose.

Cleaning Essential Oil Bottles

Bottles that have contained essential oils are best cleaned by first rinsing them once or twice with a little alcohol or tincture of soap bark (made with strong alcohol). Afterwards the bottle is rinsed with water, and a little permanganate of potassium (about two drachms for a pint bottle, and larger bottles in proportion, in some cases more) is added together with some hot water and a little hydrochloric acid. The bottles are well shaken and then rinsed with water. This may be repeated. Or, after the alcohol has been poured out and the bottle has been rinsed, a solution of hyposulphite of sodium is added, and then a little hydrochloric acid. This generates sulphurous acid, and sulphur is precipitated. The mixture is well shaken about and the bottle then rinsed with water. It will generally be found that a fine film of the precipitated sulphur adheres to the inner walls of the vessel. This fine deposit must be removed with the aid of a bottle-brush, or by shaking shot or fine gravel about in the bottle. The alcohol which has been used for rinsing the bottles may be utilized for any ordinary purposes.

Cleaning New Rubber Corks And Tubing

New rubber corks and tubing are always coated with more or less sulphur, and perhaps also some of the " filling" that is often added to them (which is often powdered soap-stone, etc.). Mere washing in water will not remove this coating, especially from the inside of tubing. It is best got rid of by boiling the goods in a solution of 1 part of sulphide of sodium and 2 parts of caustic soda in 10 parts of water. The tubing should be lifted out of the liquid occasionally, and carefully re-immersed, so that new liquid will pass throughout its bore. After having been thoroughly boiled in this manner, the goods are carefully washed in water. If the tubing is previously treated with warm water, and thoroughly kneaded or beaten, so as to loosen the coating adhering to the inside, the above-described cleaning process will be much more thorough.