The colorant is selected from the group consisting of a Xanthene dye, a cationic thiazine dye, a sulfonephtalein indicator, an acridine dye and a cationic triphenylmethane dye.

The invention also relates to a dye comprising a colorant and a branched polyesteramide, a composition comprising the dye, use of the dye as a fugitive dye and an object marked with the dye.

The dye used may be a cyanine dye.

An acid dye composition comprising a dyestuff according to the formula (I) and a dyestuff according to the formula (II) and a dyestuff according to the formula (III).

The dye is preferably a pyrromethene dye.

The colorant is a synthetic or natural colorant.

Polypeptides labelled with a donor and acceptor pair of dyes selected from a dibenzorhodamine dye and a diamino-benzophenoxazine dye are peptide conjugates which are useful for intracellular and bead-based assays with fluorescence detection.

Preferably the dye is a yellow fluorescent dye.

The marker dye may be a colorant dye or a fluorescing dye or a mixture thereof.

A dye transfer ribbon (1) comprises a supporting substrate (2) and a relatively thick dye layer (3) consisting of a dye dispersed within a dye binder.

Preferably the dye forming material is a leuco dye.

The composition may further contain a dye (sensitizing dye).

The cells may be stained by a fluorescent dye, such as a calcium, ion, voltage or pH indicator dye.

The composition may further contain a dye (sensitizing dye).

The invention relates to a colorant composition that substantially comprises a colorant of formula (1) and a colorant of formula (2) or (3).