Interesting question, hopefully I understood
exactly what you're saying.
I think the answer to your question is, no, it
still should be red. But this is why - if you just
add water to these molecules that make the bag red
(we call these dyes, usually), the water
does not chemically change what that dye is. The
water only dissolves the dye. So, if the molecule
is the same, it is still absorbing green and blue,
and reflect red.
If that seems weird, think about when you
dissolve sugar in water. You don't actually change
the sugar, it only dissolves. If you heated up the
sugar-water until all the water disappeared, you
would only have sugar left - unchanged, because
all the water that was there only dissolved the
sugar, but did not chemically change the sugar.
However, there are things that will change
color if you put them into water. If that happens,
a chemical change happened, and the
elements that make up the dye became different.
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