They're fairly high quality printouts. They pass the bend test, but anyone who's played for a long time or handled duals will see that the printing is not quite as high quality as in real cards.

I know there' some kind of light test, tearing test, etc, can anyone suggest ideas?

I've posted some scans for reference: (click pic for higher res)

http://img130.imageshack.us/f/fakes0001.jpg/
http://img847.imageshack.us/f/fakes0002.jpg/
http://img859.imageshack.us/f/fakes20001.jpg/
http://img859.imageshack.us/f/fakes20001.jpg/

Those dual have print sort of Line to the top at the bottom (typical of fake card...)

When they should Have POINT

Hope this help...

edit : you should scan the part of the dual with a Zoom Option showing like mine... you'll see the difference and thought it's enough

And I wouldn't recommend doing a bend test, although it seems that's something you've done already.

That's one of the most accurate tests I do, without any chance of hurting the card.

I went and took the liberty of scanning an unlimited Tundra and Revised Bayou out of my personal collection just now. These cards were scanned at 600 dpi.

Unlimited Tundra Front

This is the basic dot structure of every magic card from that era (and possibly since) Notice the 'pixels' are singular dots surrounded by a circle. I inverted to colors for clearer inspection. This is the pixel pattern you should be looking for when scanning in your magic cards.

Basic Magic Card Dot Structure

Although we cannot know for sure the dot pattern of your cards because the scan is not high resolution enough, I'm confident in concluding your cards are fake for three reasons.

1) Look at the Right black border framing your Bayou front. your scan shows hazy pixels where the pixels merge into the black border, forming a "fuzzy" border.

Now look at the scans on my Bayou.

Bayou Revised Front

The right black border of the frame is solidly demarcated. The border isn't fuzzy at all. It's well defined, clear and Bold.

2) Look at the back of both your Tundra and your Bayou. Now look at the backs of my two cards.

Bayou Revised Back

Unlimited Tundra Back

In particular, note the red dot on the upper left hand corner. Every real magic card has on the left side of that dot, an unmistakable whitening in the shape of a small dot right
before the black border. That little white dot or miscoloring always appears on the left side of the red dot, but ONLY by the Red Dot in the upper left frame of your card. Neither of your cards shows this. Go ahead and look for the white dot on the backs of all your other magic cards. Upper Left Side, right near the border.

3) Finally take a look again at the back scans of your cards. Look at the lower edge where the raised magic frame
meets the black border. The coloring is a little off. Normally, that wouldnt raise an issue, but its the way the
coloring is off thats troubling. On a real magic card, the back bottom border where the magic frame meets the Black border is really dark.
It's almost too dark! One has to strain a little bit to see the solid demarcation. There is a clear gradation of the brownish magic frame, before it hits the black border.

Now take a look at how your bottom frame meets the black border on your card backs. Not only do your
cards have a faint white line dividing the two, the point at which the frame separates from the
black border is a strong bold brownish color. There is no obvious gradation of the colors, it goes from
a strong black to a strong brown.

What do you guys think about this FBB german Tundra?
link
album password is: motl (first 2 scans, FBB_tundra_f and FBB_tundra_B)