Containing grey

A slap a day can be a pain
like soaking socks caught in the grain
Remember this yuck and you will see
how 1+1 can equal 3

The slurp begins before Monroe
Unable to tell the flies to grow
By 12:42 they're in the fray
searching for colours containing grey

Too many melts and they'll erupt
making the alternative cardboard corrupt
The labels can fade no more than less
so carve your egg for water cress!

The percentage leaks-you may lose your chance
Depends if le matin was there on dimanche
if this is so then a grand feast is brewed
and if not, well, I guess you're screwed.