Take note of the following before disposing of anything in the lab
Used microbial plates
Collect the plates in an autoclave bag and sterilize in the pressure cooker by boiling for 20 minutes.
Used culture tubes
Poor the content into a big bottle and collect the tubes in an autoclave bag. Sterilize both in the pressure cooker by boiling for 20 minutes.
Plastic pasteur transfer pipettes
When used to transfer liquid cultures: collect in an autoclave bag and sterilize in the pressure cooker by boiling for 20 minutes.
When used for transfering just medium or other liquids: dispose in the trash bin.
Glass: Glass pipettes, Microscope slides, Broken material
Collect in the glass wear box in the lab.
Aha! Got ya! Never ever eat or drink in the lab!
Use as little staining dye as possible in the first place. Absorp in paper towels or old news papers. Let it dry and dispose of it.
Check with the lab manager whether you can poor it down the sink (depends on the content).