How do I properly apply sodium silicate to a ceramic bowl to achieve the type of effect seen in the image below? I know that I need to apply it after I have opened the hole in the bowl on the wheel, but then what are the next steps?
When you pull your clay into the cylinder you want, scrape off the excess moisture/slip on the outside of the cylinder with a rib. Apply the sodium silicate solution with a paintbrush (to your turning cylinder) where you want the crackles. The heavier the application the larger the crackles (1 coat = fine crackles, etc.) Then dry the sodium silicate on the outside of the cylinder with a heat gun, hairdryer, or torch while turning until dry to the touch. Then push out/stretch the clay from the inside of the cylinder to form your piece.
If your crackles are tiny, you might try drying it a little bit more before stretching again.