Single-Use Tweezers, Pack of 10Single Use Tweezers Pack Of 10 Nickel plated tweezers can be cleaned in alcohol, solvents or autoclaved. It is important not to use metal tweezers when processing with Physical Developer. Instead, our disposable polystyrene tweezers are available either loose or in single use hermetically sealed packages. However, be aware that some solvents used in mixing DFO or Ninhydrin may damage polystyrene tweezers.