Our clear glass bottles of cuticle oil, for example, may be disposed of in the bottle bank, possibly with some product left over but preferably just completely used. The glass recycler can handle that just fine. Any residual product left in the bottle and other contamination burns in the melting process. However, you can do the recycler a favour by throwing the tassel in the residual waste already. Do not flush any leftover product down the sink but throw it, possibly using a sheet of kitchen roll, in the residual waste.
Our black glass bottles containing the gel nail polish cannot (yet) be recycled, as they are black and not transparent, and therefore belong with the residual waste. Handing them in as small chemical waste is not necessary. The reason our bottles are black and not translucent is to protect the gel nail polish from UV radiation, or daylight. If the gel nail polish is exposed to daylight, the product hardens and can no longer be used.
As every municipality has different rules for waste separation, we recommend you always check and follow the local guidelines.