We will see Chilli and lemon hanging on a string over doorways everywhere. This is called "Nimbu Mirchi Totka" in Hindi.
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What do our Hinduism say about this belief? What is the significance of this?
There are certain energies that are not perceived by our senses, but actually affect us. Every thought about any person, reaches him subconsciously, it requires a great deal of effort and spiritual progress to perceive them. Many a times people think negatively about us or our belongings aware or unaware.
Substances like lemon, chillies, crystal salt, camphor etc. have the capacity to remove these energies by absorbing them into their interstices and diffusing it into another medium like air, water etc., and these media being natural are storehouses of infinite energy regardless of its nature. Thus such substances are used to purify or rather decontaminate the source it is intended for.