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I have brown eggs and green ones, and one or two that lay a creamy colored egg. Sometimes, the brown and green ones will have some extra pigment deposits that aren't very dark, and are very easy not to notice, until I wash the eggs. Then, when the egg is wet, they show up better.
So my guess is that your speckled egg has these extra light freckles, but when it's been next to your skin a long time, they absorb a little moisture. Then the freckles appear darker, and it looks as if they just appeared.
I candle brown and green eggs a lot, and if your light is good and bright, they aren't too hard to see into. Green and blue eggs are harder to see into than brown ones, oddly enough. Except for the really dark ones, like Marans and Barnevelders. You might not see things as clearly as you would in a white egg, but you should be able to see the dark speck, which is the embryo, and veining around it, as well.
And, if you're lucky, you'll see it swimming back and forth! Just this year, for the first time, I started seeing movement, and I've been hatching eggs for years. I think the reason I never saw it before was that my lights weren't bright enough. My eyesight's not so great either, I'm sure that didn't help. I hope you get to see the swimming embryos on your very first hatch. It's very cool to see!
There are links to sites that show good pics of candling eggs, I think there may be some in the stickies at the top of this section. I'll see if I can find some.