**4.2 Transmittance test**

Transparency of microemulsion is the first sign of the microemulsion system. The percent transmittance is measured by UV–visible spectroscopy.

## **4.3 Scattering Techniques**

Microemulsion structures can be studied by scattering of x-ray radiations. This technique identifies the nature of microemulsions weather; it is a diluted monodispersed or polydispersed system.

## **4.4 Droplet size**

The droplet size of the microemulsion is measured by dynamic light scattering experiments or electron microscopy. Along with droplet size, it also gives polydispersity values of the microemulsion system.

*Microemulsion Formulation of Botanical Oils as an Efficient Tool to Provide Sustainable… DOI: http://dx.doi.org/10.5772/intechopen.91788*
