1) Always change the IOR to 1.0
2) Change the transparency away from pure white. Try value 80-150.
3) Uncheck Double sided material under “Options”
4) Lower the Refraction Glossiness to something under 1.0
5) Be careful that your light is properly adjusted to ensure material appears as desired. A light that is too strong will not give the desired effect, and will appear washed out. A light that isn’t strong enough will not properly penetrate the material’s surfaces, giving it a dark or black look.
