Disclosed is a salt of amonafide or amonafide analogs represented Structural Formula : R1 is \u2014nN+HR3R4 X\u2212 or R1 is \u2014nN+HR3R4 X\u2212 or \u2014nNR3R4 when R2 is \u2014N+HR6R7. The positive pressure valve has a positive pressure valve plug and a first spring, whereas the negative pressure valve has a negative pressure valve plug and a second spring. The color wheel comprises a plurality of translucent segments.