Erythema and eschar formation Level Oedema formation Level
No erythema 0 No oedema 0
Very-slight erythema (barely perceptible) 1 Very slight oedema (barely perceptible) 1
Well-defined erythema 2 Slight oedema (edges of area well-defined by 2
definite raising)
Moderate to severe erythema 3 Moderated oedema (raised approximately 1 mm) 3
Guideline (TG) No. 404 of OECD for testing of chemical (2001)(27)
T