Are there any safety guidelines for mixing sulfate with chloride? Some ceramicists decorate pottery using soluble salts (usually chlorides and sulfates e.g. copper chloride, cobalt sulfate) which are used individually or mixed to produce different colors.

I have been exploring the use of these chemicals on porcelain.  From the MSDS of each chemical I've become aware of the safety concerns and the proper precautions to take when mixing, applying, and firing them in a kiln.

But I don't know much about chemistry and do not understand the reactions when mixing these chemicals.  Are there any chemicals which should absolutely not be mixed together?  For instance, the Wikipedia article on Potassium permanganate says "Concentrated sulfuric acid reacts with $\ce{KMnO4}$ to give $\ce{Mn2O7}$, which can be explosive."  Does this mean I should not mix Potassium permanganate with a sulfate like Copper Sulfate?  In general, what happens when a sulfate is mixed with a chloride?  Are there any general safety guidelines you could offer?  Is there a fairly simple way to understand these interactions without the requirement of years of Chemistry study?

Apologies for my ignorance!

Some chemicals that ceramicists have used before:

Color


gray

copper chloride (heavy application and heavy reduction can give pinks and reds)
palladium chloride
ruthenium chloride
selenium (selenous acid, selenium toner)
silver nitrate
tellurium chloride
vanadium (vanadyl sulfate, vanadium pentoxide)

blue

cobalt chloride
molybdenum (molybdic acid)

green

ammonium chromate
nickel chloride
potassium dichromate
sodium chromate

brown

iron chloride (iron chloride emits heat when mixed with water so the water    should be added gradually in small amounts)

pink/purple/maroon

gold chloride (1-5% solution, adding either cobalt, manganese or
tellurium will give different shades)

yellow

praseodymium chloride (very pale color)

black

cobalt chloride (50% solution) and iron chloride (100% solution)
cobalt chloride (50% solution) and nickel chloride (50% solution)
Overall, always wear disposable gloves, goggles, and a dust mask.  Add a lab coat, smock, or apron so as not to contaminate your clothing.  Avoid skin contact, don't ingest and don't inhale (this includes the dust).

Manganese heptoxide is a special case with concentrated sulfuric acid.  Avoid mixing strong oxidizers (permanganate, chromate/dichromate, perchlorate) with organics.  NEVER screw around with chlorate salts.  They are powerful oxidizers with very low kinetic barriers.  Finely divided metals (especially titanium) can go to white-hot burning in open air.  Titanium burns under air, carbon dioxide, nitrogen, water...

Palladium is a heavy metal, poison and tissue corrodant.  A microgram of tellurium by any contact gives "tellurium breath" 

Local contact with chromates can cause ulceration.  Neodymium gives you purples, cerium yellow to orange.  I seem to remember that cobalt blue (cobalt aluminate after firing) in tin oxide applied to white ware gives bubblegum purple.

Tin Glazing

Gold via the Purple of Cassius is very nice.

Here's a pretty!  Suppose you mixed clay with hollow glass microbubbles, then fired.  Would the clay foam to an interesting surface or whole body?  This is the stuff, sold generally as lightweight resin filler, including hobby stores.  Most prices are outrageous when sold by volume.  Density of 3M Scotchlite K20 is 0.2 g/cm^3.  Goggles and dust mask.  Be careful or the stuff goes everywhere.

http://www.aircraftspruce.com/catalog/cmpages/bubbles.php 
Good price. 
http://solutions.3m.com/wps/portal/3M/en_US/Energy-Advanced/Materials/Product/?N=5002440+7570097&amp;rt=r3