How should you clean the lenses of microscope?

Once blown clean, lightly wipe the lens with Kimwipes or another approved lens cloth.

Explanation: Another good cleaning tissue is Kodak Lens Tissue (available at photo stores) In lieu of a brush, you can use the paper. Roll the tissue into a tube and tear it in half, with the feathery torn ends together.

answer: no, they are not.*

although rubber bands that contain excessive amounts of dye, toxins, or additives are sometimes toxic, most rubber bands do not cause any health issues. since they are typically made of latex, (a natural substance that is extracted from trees) they are not dangerous in any way if you chew them or accidentally ingest a piece of rubber band. however, chewing rubber bands does pose a choking hazard and is not a good habit to have.

*depending on the type of rubber band. the typical rubber bands that you see at stores are not toxic, but other types of rubber or latex that contains certain chemicals may be unhealthy and hazardous.