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Table 1 Thermogravimetric data and activation energy values (Ea) relative to single steps (all values are the mean of three determinations; for the temperature values RSD%≤0.5%; for the mass loss values RSD% ≤0.1%; for the Ea values RSD% ≤ 0.2%).

From: Characterization of black pigment used in 30 BC fresco wall paint using instrumental methods and chemometry

   

(sub step1a)

(sub step 1b)

(sub step2)

 

Samples

Loss of H2O

Step 1

Step 2

Res. % at 900 °C

 

T [°C]

Mass Loss%

T [°C]

Mass Loss%

Ea [KJ/mol]

T [°C]

Mass Loss%

Ea [KJ/mol]

T [°C]

Mass Loss%

Ea [KJ/mol]

T [°C]

Mass Loss%

Ea [KJ / mol]

T [°C]

Mass Loss%

T[°C]

Black-Ivory

28

    

251

     

560

     
 

46

4.9

   

404

11.6

    

654

1.8

   

78.8

 

250

    

590

     

695

     
      

250

 

113.2

   

560

 

216.4

   
      

540

     

720

     

Black-Carbon P

23

    

340

           
 

40

    

580

97.0

         

0.0

 

50

2.4

   

638

           
      

365

 

247.8

         
      

606

           

Black-Carbon Z

23

    

500

           
 

30

0.01

   

615

99.0

         

0.0

 

50

    

705

           
      

512

 

247.5

         
      

615

           

Black-Vine

23

 

170

  

375

  

480

  

625

  

770

  
 

60

4.3

260

3.6

 

440

6.6

 

490

2.8

 

700

5.6

  

2.0

74.9

 

170

 

375

  

490

  

600

  

770

  

900

  
   

170

 

105.1

500

 

375

550

 

172.0

625

 

212.4

   
   

375

  

550

  

625

  

770

     

Black-Ivory VS

27

    

250

     

555

     
 

45

3.5

   

400

14.3

    

560

4.6

   

74.9

 

245

    

502

     

690

     
      

250

 

107.1

   

555

 

211.2

   
      

500

     

710

    Â