I noted a practice awhile back of decorating the door(specifically, the threshold) with turmeric and sometimes kumkum to keep all kinds of 'yuckies' away(both in microscopic form, and to turn away the negative energy of others).
Does anyone here have any more information about this practice?
Haridra (Sanskrit) or Haldi (Hindi) , turmeric (English) and kumkum (vermillion) are said to be auspicious and drive away negative energy.
It is associated with puja of devas and the Devi -- haridra-kumkum is applied to Devi and to all deities on their forehead during puja.
People have swastik on either sides of the front door as shubha (auspicious) to only bring in the auspicious (swastika when rotating clockwise represents the kAla chakra - the wheel of time).
The swastik is red and if it is a rangoli made in the form of swastik, you will see it is sprinkled with kumkum and haridra(haldi).
Haridra - Haldi - turmeric is germicidal, protective, and has tremendous health benefits , also used to heal wounds. We see turmeric has become a health product nowadays in other cultures - something that is a natural part of the Indian day-to-day diet.
The concept behind Rangoli - dry or kolam in South India - wet, is the same.
Ideal rangoli is in the standard format and it is called "Saraswati" or represents yantra of Saraswati. You may have seen "join the dots" rangoli - patterns formed by joining equidistant dots - that is the traditional rangoli and is supposed to bring positivity and auspiciousness, knowledge, arts, expression... Again this Saraswati yantra pattern is not left white , it is sprinkled with haldi kumkumm and now with various vibrant colors.
Back to haridra-kumkum --
It is tradition for married women to apply a dot of haldi and kumkum each to each other. Guests are given farewell by applying haldi-kumkum to their foreheads (even if the lady is already wearing a kumkum dot).
In some parts of India -- there is a tradition to invite married women in the neighborhood and offer them a cool mango drink , some other foods, and haldi-kumkum applied on forehead. Then they get some token gift as they leave. This is mostly cultural - to set up a social framework for the women to mingle. It is seasonal , and called "Chaitra haldi-kunku", "ShrAvaN haldi-kunku" etc. the fun season for ladies to socialize with divinity in the center.
Why Chaitra and ShrAvaN? Coincidentally these are the months in which NavarAtra festival arrives.