Awesome !
@dkj4linux, you surely already know that other Boric Acid trick to gain more black than brown color when engraving on wood, but if not i’m sure you will make more fantastic burn with it.
Just spray/ moisturize wood with some drops of boric acid on wood will enhance darkness tone a lot with less power.
You can use that kind of ophtalmic eye drops
The Neje shop has several laser engraver models under $200 US and warehouses around the world… though I don’t see Australia. Amazon carries a few Ortur and Neje and other brand laser engravers. Banggood, AliExpress, and Ebay, also.
The neat thing about the NWT ceramic tile method is that lots of power and size is not required. I’m using a little Eleksmaker 2.3W laser module that I started with years ago… and it’s been on several machines over time. Nowadays, most people seem to be after as much power as they can get so many of the smaller, lesser-powerful, extrusion-based machines are readily available for a good price… making a dedicated machine quite possible. Also, if you happen to have a spare 2 or 2.5W laser module sitting around… mount it on your MPCNC or LR2, or whatever you have. There’s lots of friendly and talented folks here, ready to help.
– David
Hello David,
You are a wealth of information and I will look at both the Neje and the Vigotec. As you said, the power is plenty enough do do most day to day stuff on them.
Again thank you kindly for your input and hope to watch more of your videos.
James
Not getting much done but still piddling around with NWT tiles… and 3d optical illusions (delusions?). I did a few of these a couple of years ago and just wanted to see what’s new 
Zapper tools…
Torus…
Hole…
Ladies… a quintet, perhaps?
What is this?
'tis a mystery…
Here’s a nice website for tons of this stuff…
– David
DUDE THE LOGO!!! I have not tried to see one of those is many many years what an awesome surprise!
I can’t see the middle of the other one, I see some words top and bottom but lose the middle.
The logo one is home-made… the others are “found”. Maybe this will help?
Nope my eyes do not like that one, too much depth I think. I also think I see them backwards, the logo goes in for me is that right or no?
The central third of the image looks a lot like a diamond engagement ring… comin’ at ya’!
What is that indeed!
I see it as standing out from the background.
20 years ago i had 2 books of it, loved it !
TEST THIS?
that second one I can only see text in the middle, but not the top and bottom parts the others are saying that is all they can see. The logo one floats out for me as well. Very nice!
Dude, all of your projects are so awesome! You inspired me to give it a try, got a bit of work to do to get to your level but I’m still happy with it.
Keep on posting your cool projects!
Thank you for the kind words. It is pretty fun, isn’t it? And addictive! Keep up the good work.
Thanks for sharing! It has been ~ 25 years since I tried seeing one of those. It took me several minutes to lock on to “What is this?” My eyes kept burning, forcing me to blink and start all over, lol.
Remembered the trick… crossing your eyes, lol!
Another fun and enlightening test…
On another of the forums I keep up with, the subject of engraving ceramic tiles and glass was being discussed. One of the posters (@DrPete) was suggesting using black tempera paint to coat the glass prior to lasering… and showed a simple test he’d done, a few circles etched on a piece of glass. Because the circles had an etched/frosted look to them (as opposed to the black images fused onto the surface with NWT) and the method was simple enough, I decided to give it try.
So, not really knowing what to expect and taking no particular pains to be neat, I followed @DrPete’s instructions as best I could. I quickly brushed Walmart black tempera paint on a not-so-clean piece of broken window pane and lasered an image with the same little Eleksmaker 2.3W diode laser I use for the NWT ceramic tiles. To say I’m pleasantly surprised with the result would be an understatement…
To adjust for my lesser-powered laser (compared to @DrPete’s 10W laser) I used 1000 mm/min and 90% power… and got a genuinely frosted/etched image on the glass on my first attempt. Given the brush strokes in the paint were so inconsistent and streaky, I was surprised the etched surface still shows a relatively nice opaque image. But there are a few lines and streaks can be seen to coincide with some of the inconsistencies in the painted surface so I suspect a more uniform painted surface would yield a better result. Anyway, I’m encouraged with the attempt and feel it warrants a bit more playing, especially with trying to get a more uniform painted surface.
In summary… with the same laser, same glass, same image, but different paint…
flat-WHITE spray paint yields DARK embossed image… BLACK tempera paint yields LIGHT frosted image
How weird is that?
– David
darker paint absorbs more and ablates maybe while the lighter paint darkens? This is fascinating. We picked up a variety of white tiles from the tile shop the other day to give it a go.
Yeah, it’s something like that I sure. I know it’s the titanium dioxide in the flat-white paint that is the magic ingredient and it fuses with the surface of the glass/tile… leaving a slightly-raised, embossed dark image. The tempera paint OTOH appears sand-blasted/ablated… leaving a lighter, frosted image. TBH I’m thrilled to find that either effect can be achieved equally easily… hopefully, they’ll be equally permanent. 
Thank you for sharing this with us it is great information.
