Agar

Disposal of agar containing silver nitrate: How should I dispose of an agar plate containing silver nitrate? It was used to create crystals with a piece of zinc. (I put 0.8g of agar in 50mL of deionized water with 10mL of 0.1M AgNO3 and divided it into 3 Petri dishes each with a strip of zinc metal.)

Agar plate setting conditions, storage, inoculation and disposal: What are the factors that affect the ability of agar to set? Is it necessary to store agar plates in the fridge and if so for how long? What is the correct procedure for labelling, inoculating, sealing and disposal of agar plates that contain live microbial cultures in school science?