Looking for a product

My stylist was telling me about some Indian customers she had that were covering their greys with a product they got in India that only covered the grey and caused a natural looking highlight look.  She said she has had both men and women come in with beautiful looking highlights.  When asked about them, they told her they weren't "highlights," but something they used to color their grey. She does not know what product it is. Does anyone know what product this might be and where I can get it?  Thanks in advance for the help!