Difference between nutrient agar and non-nutrient agar

Agar is a gelatinous substance that is extracted from seaweed and processed into flakes, powders and sheets. It is used in cooking and as a flavorless vegan substitute for gelatin. Agar gels at low concentrations (typically 2%)  the gel is opaque in color.

Nutrient agar (nutrient medium) contains many nutrients needed for the bacterial growth. It can used for the cultivation of microbes supporting growth of a wide range of organisms.

We want to use non-nutrient agar to maintain a suitable humility for slime to grow.

WARNING – do NOT use nutrient agar


Do you have access to microwave oven or hot water bath? 

(click on image for additional information)

Example of microwave oven

Example of water heater









How to make agar

(video guides for microwave and hot water bath)