Platinum Recovery

All,

This is my first post and very first time here. I have heated an automobile catalysts in concentrated Aqua Regia for 5hrs and stannous chloride tested positive for Pt. Here is the picture of the solution after 10mins of boiling in AR.



Then I tested it with stannous chloride and here is the result



The same solution after being left outside over night, it changed color as you can see here.



Just to test, 20ml of the solution is being evaporated on steam bath to get rid of NOxx and added 20ml of HCl after it turned to syrup. This step repeated 2 times



Solution after being on steam bath for few mins



After hydration the syrup with HCL I added half of its volume water.


I added ammonium chlorate to dilute solution while being on steam bath, and all i got was some small amoutn of white fine powder at the bottom at the picture


Now can someone tell me what I do wrong here? I mean how can i get the yellow powder that is pt?

Thanks
Kev