In article , snipped-for-privacy@invalid.invalid mentioned...
Well, that's why I included the smiley.
IIRC, saturation is the point where Ic has reached its maximum value, and further increases in Ib won't increase Ic. THe .7 or so V between emitter and base (assuming an NPN) is a half volt or more greater than the < .2V collector to emitter, so the collector-base junction is on the verge of being forward biased. So more and more collector current 'leaks' into the base.
When the collector-base junction is no longer forward biased, then the transistor is no longer in saturation.