[Avodah] Bittul of non-K and Chametz during Pesach

[Meir Rabi]

HaRav Sh Z, explains that although Chamets during Pesach is not Battel
1:1000, nevertheless it is Battel when it is not at all discernible. This
means that at 1:1000 it is still discernible. Consequently 1:60 is certainly
discernible. Now this is strange since 1:60 is the rule of thumb at which we
assume taste is no longer discernible.
It seems that HaRav Sh Z is saying that at 1:1000 (which is not an exact
ratio - unlike 1:60) only the most finely attuned palates can discern. That
is enough to render Chamets during Pesach, not Battel.
At =>1:60 the average palate can discern flavour, that is enough to render
ordinary non-K foods a significant factor in the mixture thereby making the
mixture prohibited.
At <1:60 that average palate can not discern the flavour, that is enough to
render ordinary non-K foods an insignificant factor in the mixture thereby
making the mixture permitted.

What happens if we have food produced in machinery which has non-K BeliOs,
which by calculation are =>1:60 yet are not discernible by even the most
finely honed palate?

I therefore believe that these perspectives of HaRav Sh Z are remarkable.
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