I understand that you’d like to see how much is left in the bottle but the reason why we use the blue or white painted bottles is to protect the natural ingredients against UV light.
Here's a trick: once you cannot get anymore product out easily you may add a few drops of water, close the lid and shake well in order to get the remaining product out. Once you have added water you will need to use the remaining product within a week.
I hope this tip would help! Should you have any questions, feel free to email us. Thank you so much