1. lift the bottle of BTB solution2. add BTB solution to 3 empty glass bottles3. go to the lake and catch a black horse4. put the black horse into the 2 vials of BTB solution5. close the lids of the vials with BTB solution6. cover one of the vials of BTB solution with the black horse with a black tin to prevent sunlight from getting through7. observe the changes that occur after a day or so8. remove the black tub9. observe three bottles of BTB solution alone and three bottles of BTB solution with black horse, one covered and one uncovered by the black canister
