Storing matcha tea in a thermos? lately i started to drink matcha tea, as an experiment instead of coffee, and i have read many descriptions about it.

I want to drink matcha tea to work, but i dont want to make it every time here,but instead to have it in a thermos.I have an 1L stainless still thermos and the quantity is quite enough for 3~4 cups of tea.

So, is it ok to make the tea in the morning and having it till the end of working day or this process is not good for the tea?
Will it change the color of it also?

Regards
It might be worth trying coldbrew matcha for what you're trying to do. If you have a thermos already, try it at home over a weekend and see if it keeps well enough for your tastes. Matcha may settle if you leave it long enough, and many people enjoy the froth the most, so it really benefits from being made and drunk fresh.