The last I heard Arco was not color tested at all but was believed ( due to pedigree that was given but not proven with DNA or papers of any sort) to be a Sooty Palomino. The pedigree given, there would be many more "Silvers" in the Andalusian breed if the sire and dam where verified. Lines of Chestnut and Cream.
FYI: we lent a high school trained stallion we trained and owned to the owner/importer of this horse who has since gone back to Spain.
To this date as well, he has no papers in Spain or the US. What used to be called a Media Carta, was the only thing he had but all horses where these papers, sadly for the owners, became void as any horse could get them with a claimed Andalusian sire or dam. Many where found to have no Spanish or Portuguese blood in them at all, and if so, very little. (veried by Blood typing in Spain). They stopped allowing the registrations with the claimed name Media Carta in 1999. We found out about that in 2004 when we bought a horse with such papers but when we pushed to have pedigree verified the horse was resold. However since then we have purchased another stallion, importing him ourselves from Spain of Pure Spanish Portuguese Bloodlines (incorrectly called 1/2 Andalusian 1/2 Lusitano). He has been DNA`d and Micro chipped with the Spanish Military and his papers state he is of Pure Blood ("quidos de pura raza").
I will have to go back onto my papers to find the pedigree of Arco. We had been interested in this horse till we found out that he was not registered and never confirmed to be a purebred Andalusian. Please note the Spanish (PRE) and Portuguese (Lusitano) is the same horse by bloodlines. However in some Spanish lines there is a mix of Arab and Breton blood. The Breton being very simular in looks to this stallion, ARE known to have "Silver Dapple" coloring.