Apochromatic Objective Question

The first Cooke photovisual objective was sold in 1899.
It was a kind of apochromatic objective; however, it aimed at bringing
ultraviolet light as well as visible light to a common focus.
This was long before 1969, when Canon started selling fluorite lenses
for cameras.
One source claims that it was discovered that the new Schott glasses
that
made such lenses as the Cooke photovisual possible were unstable; they
deteriorated after a few years, and so this type of lens was realized to
be impractical, and Schott stopped making those glasses.
However, it seems as though this can't be the explanation, as there
are reports of Cooke photovisual objectives that have survived to the
present which are still in usable condition.
The other possibility is that since the correction provided by this
kind of lens extends to the ultraviolet, perhaps that means that the
degree of correction for chromatic aberration it provides within the
visible spectrum is reduced, maybe the amount by which chromatic
aberration in the visible range is corrected isn't much improved over
that of plain achromatic lenses.
But that also doesn't seem to be the case; the lens is described as
virtually making chromatic aberration g away completely.
So I'm puzzled. Why didn't the Cooke photovisual lead to a continuous
availability of apochromatic lenses prior to Canon's introduction of
the fluorite lens in 1969?
John Savard