Additives and chemicals.

A 1 litre bottle of strong 15 percent sodium hypochlorite. You dilute it with cold water on site to clean and disinfect tubs, tools and grow room surfaces between batches.

A 1 litre bottle of 3% hydrogen peroxide (10 volume) for spot-treating early cobweb mould and sanitising tools and work surfaces. It breaks down to water and oxygen and leaves no residue.

A one litre bottle of 70 percent isopropyl alcohol for wiping down gloves, tools and work surfaces before clean work. It disinfects, it does not sterilise.

A plant-based gelling powder from red seaweed. You add it to a nutrient like malt extract to set firm, clear plates for starting and cleaning up mushroom cultures.

A soluble 15.5-0-0 calcium nitrate: a calcium and nitrogen supplement for compost-grown mushrooms like button and portobello, and for the casing layer that goes on top.

Food-grade dextrose powder, the simple sugar mushroom mycelium feeds on. You add it to liquid culture and nutrient agar to give cultures a clean, fast carbon source.

Food grade glycerine for the lab. Its main job in mushroom work is as a cryoprotectant, so you can freeze mycelium and spores without ice damage killing them. Supplied in a 130mL bottle.

A food-grade dry powder made from malted barley. It is the standard sugar base for malt extract agar and malt extract liquid culture, the two media most home growers use to grow and keep clean mycelium.

A water-soluble protein powder that gives mushroom mycelium ready nitrogen and amino acids. A small amount enriches a litre of liquid culture or agar.

Caustic soda pellets for degreasing glassware and gear and for nudging the pH of substrate water upward. A strong base that needs care, not a pasteurising shortcut.

A concentrated dry nitrogen supplement for Phase I mushroom compost. Mixed in at the start of composting to raise nitrogen and feed the microbes that heat and condition the substrate.