PH3 is formed there along with acetylene under the reaction of Ca3P2 with CaC2 where , the phosphene reacts with acetylene formed and catches fire to get smoke which forms the smoke screen.
In Holme's singal , the calcium phosphide and calcium carbide is thrown in sea where the reaction produces phosphene gas and acetylene and the phosphene catches fire with acetylene and forms smoke which sends the signal
Ca3P2+6HO→3Ca(OH)2+2PH3
2PH3 +4O2→P2O5+ 3H2O
P2O5 forms white dense smoke screen.
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