On contact with water the paper changes colour from light blue to dark blue. The reaction is not reversible. Even after drying the contact with water can clearly be proved.

IFU Test paper, qualitative, udder test paper for detection of mastitis.pdf

SDS_Udder Test Paper

Specifications

Chemical method:
Color reaction with a pH indicator
Pk:
20
Description:
Udder test paper for mastitis
Dimensions:
100×140×7 mm (packaging)
Tests per kit:
20 Tests
Range:
0
Cat. No.:
MANA90748
Sensitivity:
Mastitis - Traces
Contents:
20 sheets in PE bag
Platform:
Qualitative test paper
Compliance:
Not CE certified and no hazardous material
Shelf life (months):
24 (from production)
W×D×H:
90×140 mm (net)
Weight:
48,13 g