A bit of scrap platinum. A way to produce Potassium Chloroplatinite for my photography? Best left to pro lab?

I was shopping at Bostick and Sullivan to get supplies and was sticker shocked by the price of Platinum now days.

Is there a way to make Potassium Chloroplatinite safely in my studio or is that best left to a pro lab?

I wouldn't mind buying a bottle. But at $20 a milliliter I can't right now.

I figured since I already have the platinum, the expensive part, I would ask.

You would first need to dissolve the platinum in aqua regia, and then add potassium hydroxide. This should give you a solution of potassium chloroplatinate.

There's the procedure, now here come the cautions:

I would really, really strongly recommend that you not actually try to do this. Aqua regia, a mixture of nitric acid and hydrochloric acid, is really bad stuff to handle. It should only be mixed immediately before use, and the neutralization by adding the potassium hydroxide should be done as immediately as possible after the first reaction is complete.

Aqua regia decomposes into chlorine gas and nitrosyl chloride, and the reaction with platinum liberates nitrogen oxide. All of these are really bad things to breath, so it should go without saying that aqua regia absolutely must be handled outside or in a fume hood. Also, safety glasses are an absolute must.

This is quite a dangerous reaction to carry out. I have available to me all of the necessary reagents and safety equipment(fume hoods, etc) and still would not carry it out. I strongly suggest that you do the same.

You don't have the lab equipment necessary to make those chemicals economically.

Either use a lab or just buy a bottle of the chemical and be done with it.