Chemical to etch weld profile on aluminum

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I'm practicing butt and fillet welds on 1/8" 6061 T6 aluminum.  I cut a cross section of the weld and sand it smooth to check the penetration but it's not easy to see.Do any of you know of a chemical that will etch the aluminum and make the weld/HAZ/base easier to see?Miller 211 w/ spool gunMiller Dynasty 200DXLongevity 60i IGBT plasmaO/A w/ crappy chinese torch/gaugesSouth Bend 10K latheGrizzly 4029 10x54 millGrizzly 7x12 hor bandsawangle grnders, bench grnder, bench belt sndr7.5 hp 80gal cmprsor
Reply:make sure to polish the cut section as much as possible then brush with muriatic acid.
Reply:here is one link on Al etchantshttp://www.metallographic.com/Etchan...20etchants.htm