Instruction Manual Update and Workshop

First, I will be teaching a 3-day workshop in Tuscon, AZ, during the gem show. The dates are February 14-16. Please contact Lyle Rayfield at: The topic of the workshop is “Patterns of Colors in Hollow Forms.”

Here are a few samples:




Half the Rock

Second, the Instruction Manual for Hadar’s Clay has been updated and is marked October 25, 2013.

For your convenience, the changes are highlighted in yellow.

Here are the main changes:

1. The firing schedule and programing instructions for firing two phases in one uninterrupted session have been added. This schedule lasts around 6 hours and includes the cooling time. It is best for overnight continuous firing and for firing at 2-5 day workshops.

2. The firing temperature for the first phase of firing has been lowered to 1000°F/538°C.

3. Pearl Grey Steel XT is now recommended for color patterns (mokume-gane) fired at mid-fire schedule. Low Shrinkage Steel XT is recommended for structural purposes, fired at high-fire schedule.

7 Responses to “Instruction Manual Update and Workshop”

  • Cindy Pope Says:

    Thanks Hadar 🙂 as always I like that you have highlighted the changes.


  • Brian Says:

    Thank you for the updates! Awesome job as usual.

  • Ro Germaine Says:

    Love not reading the entire manual to find the changes. However, it would not hurt for a refreasher.
    Thanks for the update.

  • Lyle Rayfield Says:

    Hadar – thank you, thank you….the yellow highlights are awesome. I love saving trees by not having to re-print the entire manual.

  • Elaine McLaughlin Says:

    My question is in regards to firing temps for the quick highfire bronze xt,, I first fired it at a 250 degree an hour until it reached 1550 degrees , and then held it for three hours and let it cool in the kiln overnite, it came out looking not properly sintered and still felt like clay, it was in activated carbon in a stainless container with a lid, so I refired it at a short run one hour ramp to 1525 degrees and held for one hour and the pieces still came out looking not properly sintered, so now ive switched to activated coconut carbon and am repeating the long slow first firing to see what happens,,, maybe you have some tips for me,,, im just learning about metal clay,,, I love your work and look to you for inspiration all the time,,, cant wait to hear back from you

  • Hadar Jacobson Says:

    Elaine, You are using the wrong firing schedule. Please have a look at the instruction manual at It’s on the right panel of the blog. There is no need to ramp so slowly. Let me know how it goes.

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