Two weeks ago a new feature was added to the Hadar’s Clay™ Users Discussion Forum. I am adding this feature to the blog and will also post it on my Facebook page. The Users Discussion Forum is a wonderful tool for sharing information, discussing issues, and showing your work. As of today there are currently 935 members. You are welcome to join.
Here is the new feature: Every week, on Sunday, a multiple-choice question is posted. The posted questions may range from beginners’ level to accredited teachers level. Some of them may sound obvious; some may sound complicated. The suggested answers to each question may be incorrect, partially correct, or reasonably correct. However, there is only one correct answer, which is the best answer.
You don’t have to post your answer. These questions are meant for you to test yourself and clarify issues regarding the nature and use of Hadar’s Clay and other brands of base metal clay. I will post the answers halfway through the week, so you can compare your answer to mine. Then, if questions arise, you can post them on the Users Discussion Forum, on this blog, or on my Facebook page, or you can email them to me and I will post and answer them without disclosing your identity. You are welcome to discuss the questions and the answers. You are also welcome to email me questions that you would like to see discussed.
Here are the two questions and answers that have already been posted on the Support Forum. The third question will be posted this coming Sunday.
First question: Can you fire Hadar’s Clay with a torch?
3. Yes, but you need to do it for at least one hour.
4. Torch-firing Hadar’s clay is not recommended.
5. Only One-fire Copper can be fired with a torch.
6. You can fire base metal clay with a torch, but then you need to re-fire in carbon.
7. You can fire base metal clay with a torch only if you manage to cover the whole piece with the flame so it is not exposed to oxygen.
The best answer is #4.
Second question: True or false: Pieces cannot sinter under carbon because the binder has no oxygen to burn out.
2. Not true: there is always enough oxygen under the carbon for the binder to burn out.
3. It depends on how much carbon there is on top of the pieces.
4. It depends on the type of carbon.
5. Above a temperature of 1000°F (brick)/1100°F (muffle) there there may not be enough oxygen in the carbon for the binder to burn off.
6. It depends on the total amount of carbon per number of pieces.
7. It depends on how many times the carbon has been used.
The best answer is #5.