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As you mention, alkohol tends to revive the colouration. Grey will not turn easily red, but slightly red might turn very red .... beware of this.
Secondly, italica is very variable in colouration. Your statement that first antennal segment is not red in italica is generally but not necessary always true.
Finally, when I look at these pics, it seems to me that there is an indication of a sublateral spot on second tergite. If so, this would confirm my gut feeling, namely that this is the female of H. grandis.


Theo