Disodium edetate in an amount of at least 0.01 % is an effective stabilizer of a low level of colouring of Castellani’s solution without fuchsin Ph.B. MMII. Spectrophotometric measurement of colouring and expressing in numbers of colour differences ΔE* in the uniform colour space CIELAB from transmittance seem to be a suitable method of stabilization efficacy control of colouring of the preparation

        Key words: Castellani’s solution without fuchsin – stabilization of colouring – disodium edetate – CIELAB