Question

In Glaze which materials are used for blue colour? A. Chrome oxide
B. Cobult Oxide
C. Barium Oxide
D. Cobult carbonate
E. Copper phosphate Choose the correct answer from the options given below:

• A. B, D and E Only
• B. B, E and C Only
• C. B, E and A Only
• D. B, A and D Only

Hint:

Logic Tip: Cobalt compounds are the most common materials used for producing blue ceramic glazes.

Answer 1

The Correct Option is A

Concept:
Different metallic oxides and compounds are used in ceramic glazes to produce specific colours during firing. Blue glaze colours are commonly obtained from:
• Cobalt compounds
• Certain copper compounds
•

Step 1:
Cobalt oxide is one of the strongest and most reliable blue colourants in ceramic glaze. Thus: \[ B \text{ is correct} \]
•

Step 2:
Cobalt carbonate also produces blue shades in glaze after firing. Thus: \[ D \text{ is correct} \]
•

Step 3:
Copper phosphate can produce bluish-green to blue effects depending on glaze chemistry and firing atmosphere. Thus: \[ E \text{ is correct} \]
•

Step 4:
Chrome oxide mainly produces green colour while barium oxide acts primarily as a flux rather than a blue colourant. \[ \boxed{\text{(1) B, D and E Only}} \]