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.
<div>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.</div><div>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.</div>
<div>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.</div><div><br></div><div>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?</div>
<div><br></div><div>I therefore believe that these perspectives of HaRav Sh Z are remarkable.</div>