Mike Sibley wrote: βSat Jul 04, 2020 2:40 pm
... if you sanded something away completely, could you burn it again (but differently) in that same area?
The Poplar plywood is made of few thin sheets bonded together by the glue, which most certainly is based on chemicals.
For obvious reason it's not recommended to heat the glue, because those toxic fumes aren't friendly for our lungs
So gently scratching the top of the surface is ok, but to avoid scratching deeper into the wood, where the glue might get exposed to the heat.
Obviously it doesn't matter if you burning on natural piece of wood
The yesterday's correction I did by gently scratching off that softly burned area, using fibreglass pen, and I went over it with equally gently burn, to correct the shape and curve of the nose.
The fine sandpaper would will do the same job as good.
I did it with extra care, and the fibreglass pen is adequate for that purpose, it's allowing gentle and precise scratching on the surface.
There's no problem to burn over the scratched area, because it was softly and smoothly scratched off.
Deeper scratching could be compared to indenting, which may become more tricky to cover with equal burn to mask those "indented" marks...
Softly shaded areas by hot tip is obviously easy to scratch off, and correct.
The hotter the tip gets, the burned mark goes deeper, which is making correction more difficult, as the scratching will also have to be forced deeper the surface.
The Poplar plywood is light in colour and it's soft panel.
I do prefer it, because the darker the wood, the less visible the burning effect.
Also the wood is getting darker by itself after longer period of time, so the burned art is fading away too - not good at all.
Not to mention the varnishing is already darkening the whole equally.
You might not be aware, that the burned areas are getting lighter in few days time...
So too dark areas becoming lighter in few days, and soft shading is fading away,much less visible then...
In pyrography matter it's kind of a *habit to go darker for the above reason.
The above effect and a dark wood are not good match at all
The fading effect is making me go darker than I usually would like to, it's also making me go few times over the same area to adjust the faded shade tones.
Bare in mind then Mike, every time when you going to comment the pyrography art that was posted straight away after the session - the *too dark areas you can see, will fade away later, so it is not issue, it will get lighter.
They are burned darker - for purpose.
Well.
I wanted reply with few words only, and I have written half of the book already