The term "acid-free" denotes that the paper possesses a pH of 7.0 or higher, indicating an alkaline nature. This type of paper undergoes manufacturing with fewer chemical agents, rendering it a more environmentally sustainable choice. 

Disclaimer: We include the nuances! 
It was a deliberate choice to filter in the nuances. This means we don’t just include certified accreditation but also unregulated terms and commonly used jargon. We chose to do this in order to gain a more rounded picture of each brand, aiming to enhance the validity and reliability of our understanding of their ethical stance.