From natural to chemical

In earlier times, Gulal powders were prepared from flowers coming from trees, such as the Indian coral tree and the flame of the forest, that had medicinal properties, beneficial to the skin. After the advent of synthetic dyes in the middle of 19th century, the disappearance of trees in urban areas and the pursuit of higher profits led to the abandonment of natural colours.^[3]

The new industrial dyes have been manufactured through chemical processes with non-standard parameters and hence the resulting colours are sometimes toxic for face and skin, causing problems such as eye irritation, allergies, skin infection and asthma.^[4] Unsafe products have often been sold on the road by small traders, in boxes with labels saying "for industrial use only".

Recent production from natural sources

Indigofera tinctoria

Recently, the various harmful effects and concerns for the environment (synthetic powders caused temporary wastewater pollution, too) generated awareness and encouraged people to celebrate an eco-friendly Holi. For the preparation of herbal gulal, a variety of safe dyes can be used, such as turmeric (Curcuma longa), indigo (Indigofera) or annatto (Bixa orellana), which are all ingredients easily available on the market at moderate prices.

In the new natural processes to make herbal gulal, no salts of any heavy metal have been used and the combination of ingredients provides a powder having soft and supple touch with good sticking capacities to skin. The production profile of dry colour composition is eco-friendly as no toxic ingredients are released under the preparation. In this way, it has been possible to replace synthetic colours with natural ones.

Religious and cultural uses

Gulal powder has always had an important role in Hindu culture and has always been used for religious purposes. Besides Holi festival, the use of coloured powders appears in other ceremonies, such as funerals. In this case, in some populations, a particular ritual occurs when the deceased is a married man. The widow puts on all the ornaments she possesses and takes leave of her husband adorning him with all her jewels. Holding a small brass plate with colored powders, she lets the men participating in the ceremony paint the face of the deceased. This ritual is associated with the one of marriage, in which the bridegroom and the bride anoint themselves with coloured powders for four days before the wedding. This ointment, indeed, is meant to prepare their bodies for conjugal life.^[5] Beyond the religious sphere, the consumption of gulal powder is spread for different uses.

Scientific uses

One use of this powder has been developed in the field of latent fingerprints. A study by Punjabi University of Patiala shows that the application of gulal or food colours to latent fingerprints can give clear results. During this study, a few grams of dry colours were taken and sprinkled over different surfaces, such as normal paper, on top of CDs, over aluminium foil and aluminium sheets. It was concluded that commonly and easily available agents are a useful substitute for the decipherment of latent prints.^[6]