1. Avoid using solid colours or opaque windows
Solid colours tend to cut away users from what is happening in the background. With glass material users can still be aware of what is happening in their surroundings.
2. Text colour always defaults to white
Colours other than white don’t go well on glass material. You risk it blending with colours of objects in the environment surrounding the user.
3. If you need to use colour use it in the background layer
Glass material can have different colours based on what is behind it. Colourful elements on top of glass material may be difficult to see if colour of the glass is similar. Stick to white text or symbols most of the times.