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Macro etching of aluminum alloys with high silicon

Does anyone know of an etching solution suitable for aluminium alloys with high silicon?
(Composition: %11-12 Si , max. %1 Fe, % 1.75-2.50 Cu, max. 0.5 Mn , % max. 0.4 Mg, max. 0.7 Zn , max. 0.3 Ni, max. 0.15 Ti , max. 0.1 Pb , max. 0.1 Sn, 0.015-0.025 Sr )

Utkan
- Istanbul, Turkey
2005

Most etches for Aluminium and alloys contain HF and other acids, used by dipping or swabbing.
I normally use Flick's reagent = 10%HF, 15%HCl in water.
Or Kellers reagent = 1% HF, 1.5% HCl, 2.5% HNO3 in water is slower.
But be careful, keep HF off your skin.
Regards,

Martin Rich
Ship Repair - Plymouth, UK
2005

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