Supplier Page from Thermo Fisher Scientific for Congo Red, indicator grade
4-Bromobutyric acid, 98% from Thermo Fisher Scientific
DL-Menthol, 99% from Thermo Fisher Scientific
Ethyl acetoacetate, 99%, pure from Thermo Fisher Scientific
L(+)-Glutamic acid monosodium salt monohydrate, 99% from Thermo Fisher Scientific