UPF characteristics of natural dyes and textiles dyed with them.

The UV absorption spectra of some natural dyes have been recorded and analysed. Most dyes have good absorption in the UV range. Results show that some of these dyes can be used to produce cotton and polyester fabrics offering high UV protection, giving UPF values between 35-50. The UPF appears to be closely related to the fibre properties and the dye fibre interactions and the same dyes can give very different results on different fibres. KerriaIacca dye gives very good results on both nylon and polyester but has no affinity for cotton. On the other hand, Terminalia chebula and Punica granatum show good results on cotton fabric. In general, UPF value has been shown to have no correlation with the K/S value of the dyed fabric. [ABSTRACT FROM AUTHOR]