Glass is a completely hygienic material which can be recycled indefinitely without any loss in quality. As a container it is neutral in relation to its contents.
Glass waste from households is collected separately nowadays and sorted into white, green, and amber glass. This allows it to be converted back into the original glass colors. In the melting furnaces of the glassworks, the recycled glass fragments are furnished with additives depending on the purpose of production and then processed into new bottles.
The possibility of recycling glass as often as desired saves natural resources (such as sand). Used glass also plays an important role in the cost-effectiveness of manufacturing new glass products by saving energy.