Low-priced stock that sells at less than $1.00 per share. Often highly-speculative and volatile, such as start-up mining companies. While, in general, penny stock are considered high-risk securities, some penny stock mature into less-speculative investments. All penny stock are traded over-the-counter.
In its natural form, cork is also a very good fire retardant, although cork dust is actually extremely flammable (because here the cell structure has been broken down). Impermeable: Cork has a magic chemical in its cell membrane that makes it completely impermeable to liquids and gases.
Damp air keeps wine corks from drying out, which forces the cork to stay expanded and ensures a firm seal. Laying a bottle on its side will also ensure the cork remains moist on the inside, which is just as important to keep the cork swollen. The ideal humidity level for your cellar is 55%-85%. If youâre concerned about humidity, buy a hygrometer to measure your cellar's humidity level. You can always install a humidifier if your cellar is dry, but be careful not to let the humidity rise much above 90% as this will cause mold to grow on the corks.