pH paper is used in the chemical vat & in woad extraction to measure alkalinity or acidity. This is Universal pH paper (pH 1 to pH 11) supplied as a book of 20 strips; each strip is 1 cm wide by 6.5 cm long and is used once only. Each book has a colour comparison pH chart.
The pH paper book is packed in a polythene bag, placed in a small padded envelope and posted to you First Class.
Teresinha at Woad.org.uk Studio 319, Scott House, The Custard Factory Gibb St, Birmingham B9 4DT, UK
Contact Teresinha for enquiries on Tel: +44 (0)7979 770 865 email: firstname.lastname@example.org