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The default ColorFunction of Plot, Plot3D before v10 is respectively mentioned here and here, but I failed to find a related post for that of DensityPlot.

If I knew this, I could use ArrayPlot to imitate DensityPlot more perfectly!:

Row[{DensityPlot[Sin[x y], {x, 0, 3}, {y, 0, 3}, Frame -> None], 
     ArrayPlot[Compile[{}, With[{r = Range[0, 3, 1/40]}, Sin[r #] & /@ r]][], 
               ColorFunction -> "Aquamarine", DataReversed -> True, Frame -> None]}]

enter image description here

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    $\begingroup$ "LakeColors"... $\endgroup$ – Brett Champion Jan 16 '15 at 20:08
  • $\begingroup$ @BrettChampion Oh……I see. You can make this into an answer, anyway it's not that obvious, I think. $\endgroup$ – xzczd Jan 16 '15 at 20:17
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    $\begingroup$ No, it's not obvious, which is why I gave you a way to find the function without guesswork. $\endgroup$ – Mr.Wizard♦ Jan 16 '15 at 20:18
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Let's find out:

classicDensityPlot = 
  Trace[
    DensityPlot[x y, {x, y} ∈ Disk[], PlotTheme -> "Classic"],
    _Blend &
  ] // Flatten // First // ReleaseHold

ArrayPlot[Compile[{}, With[{r = Range[0, 3, 1/40]}, Sin[r #] & /@ r]][], 
 ColorFunction -> classicDensityPlot, DataReversed -> True, Frame -> None]

enter image description here

enter image description here

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