Allow the sweet tamarind sauce to cool down completely. Transfer it to a clean airtight jar and store in the fridge. Ensure to use a clean dry spoon to scoop out the required chutney whenever necessary. Alternatively, divide the chutney into required portions, pack it in a jar and store in the fridge. Use one jar at a time, ensure to finish it off in 2-3 days if you are unsure of using a clean dry spoon. The wet or unclean spoon results in the growth of bacteria over a period of time and spoils the chutney.