Can't see QwtCurve with aliceBlue color QPen

I'm using a QwtPlot based on one of the samples, with multiple curves.

When my QwtCurve is configured with a aliceblue color pen, I don't see the curve (this does not reproduce with other colors).

Would be hard to put in all the code that draws the points but here is the color related part:

Relevant header:

Code:

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//! Collection of all curves in plot
QMap<QString, QwtPlotCurve*> mCurves;

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Code in constructor:

Code:

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setAutoReplot(false);
 
    //! No caching
    canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, false);
 
#if defined(Q_WS_X11)
    // Even if not recommended by TrollTech, Qt::WA_PaintOutsidePaintEvent
    // works on X11. This has a nice effect on the performance.
 
    canvas()->setAttribute(Qt::WA_PaintOutsidePaintEvent, true);
    canvas()->setAttribute(Qt::WA_PaintOnScreen, true);
#endif
 
    plotLayout()->setAlignCanvasToScales(true);
QwtPlotGrid *grid = new QwtPlotGrid();
    grid->setPen(QPen(Qt::gray, 0.0, Qt::DotLine));
    grid->enableX(true);
    grid->enableXMin(true);
    grid->enableY(true);
    grid->enableYMin(false);
    grid->attach(this);
 
	for (int i = 0; i < objectsToPlot.count(); i++)
	{
		QwtPlotCurve *currCurve = new QwtPlotCurve(objectsToPlot.at(i).combinedIndex);
		currCurve->setStyle(QwtPlotCurve::Lines);
		currCurve->setPen(QPen(objectsToPlot.at(i).color)); // Here: color is aliceBlue
		currCurve->setRenderHint(QwtPlotItem::RenderAntialiased, true);
		currCurve->setPaintAttribute(QwtPlotCurve::ClipPolygons, false);
		currCurve->setZ(i);
		currCurve->setData(new QwtPointSeriesData());
		currCurve->attach(this);
 
		mCurves.insert(objectsToPlot.at(i).combinedIndex, currCurve);
	}

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aliceblue is a very bright blue. on a white background it might be almost invisible, have you tried with a dark background? can you see aliceblue in an other context (painting tool,...)? I had this once with a bright yellow which made me crazy until I found out it was the brightness of my monitor that made the color not visible...

Thanks, when I changed the canvas background to Qt::black I saw it fine :)