Pyrotechnic colorants- reactions & safety concerns regarding making charcoal discs
The best way for you to find out if a chemical is safe for your use case would be to look at the safety data sheets for your chemicals. For your convience, I have linked to relevant ones below. 


Copper (II) Chloride
Calcium Chloride
Borax
Copper (II) Sulfate
Alum
Strontium Chloride
Potassium Chloride
Lithium Chloride
Sodium Chloride
Magnesium Chloride
Aluminium Powder


In general, you will find that most metal salts are acutely toxic. Take for instance, the Copper (II) Chloride, which is noted as having the following hazards, as noted in Section 2.1 Classification of the substance or mixture: 


Acute toxicity, Oral (Category 4), H302
Acute toxicity, Dermal (Category 4), H312
Skin irritation (Category 2), H315
Serious eye damage (Category 1), H318
Acute aquatic toxicity (Category 1), H400
Chronic aquatic toxicity (Category 2), H411


From the same section in the SDS for Aluminum Powder, you will find that it has the following hazards: 


Flammable solids (Category 2), H228
Acute aquatic toxicity (Category 1), H400
Chronic aquatic toxicity (Category 1), H410


You can find out more about these hazards from the EPA GHS Criteria Summary, and the Wikipedia GHS Hazard Statement List.

Overall, you should look over each SDS and make sure that the chemical you are proposing to use is safe for your purposes. 

Cheers