The Thames pH Book

1X4 | litmus paper
The Thames pH Book, a multiple of tiny litmus paper page books which are dipped page by page in River Thames water collected from 18 sites on one day (with the help of the Environment Agency). The river journey is encapsulated in a rubber-stamped list of locations combined with the physical water traces. In a plastic bag with folded graph paper insert.
The Thames pH Book listed in: