Great product but they stain your chalkboards
936137
they work. They are pretty opaque. I use them for writing chalkboards and doing art at restaurants. Seem to hold up nicely, BUT BEWARE: they will stain any chalk board paint (and probably chalkboards too) even just a few minutes after applying. Even white vinegar doesn't seem to remove it unless you scrub the hell out of the board....so I just repaint sections with more chalkboard paint to cover up old signs.
602946
The item arrived with one pen broken.  Rather than return them I decided I could just live without that color.

These markers ruined my chalkboard.  I tested them on the board and it came right off. I went ahead with my message on the board.  After one week everything wiped right off.  I wrote another message using different colors.  The light blue would not come off completely.  You could still see it a little but I wrote another message on the board. This time I used only the white marker.  Big mistake. It won't come off at all.

I did a lot of research on these and other chalk markers before buying these.  I decided to buy these due to all the positive reviews. Now my board is ruined.  Hopefully I can just buy some chalkboard paint to cover it up.
1455623
Great product for a great price.  They worked perfectly on Chalkboard Paper!
2604816
These worked great for creating chalkboard signs for photos. Be careful though! They absolutely would not come off of the cheap, chalkboard painted chalkboard I bought from Target. As long as you're using it on an actual slate chalkboard, you should be fine!
2570730
I found an unexpected use for these markers in my classroom. I have black lab tables and desks in my science room and I can write on those tables with chalk. These markers work like chalk but provide my students with a more colorful way to produce drawings and make labels! On my tables the markers are best removed wet- erase style, but do rub off with a small effort.
1602172
I'm not sure if they're supposed to be used with a specific brand or type of chalkboard, but these stained the desk I treated with chalkboard paint.
4804250
write very nicely, but seem to stain my board more than other markers. Since buying this set I'm cleaning it far more frequently. Especially with the red marker, the board looks pink after I wipe it off
3194880
I agree with the other reviews - very disappointed and they have permanently stained my white board.  DO NOT BUY!!!  * I never write reviews but felt the need to warn others before buying!!
3845692
I was super excited to get and use this product!  I wanted to have a chalkboard wall in my kitchen for my us all to use and enjoy but was not excited to paint... so I bought 2 of these to put up on my wall... The product came with some initial dents in it, which cause the "Chalkboard" to flake off.. but I did not cause a stink cause it would be written on.  HOWEVER, only after the VERY FIRST TIME using it and wiping away the chalk I can see that the pressure from the stick of chalk has caused the chalkboard material to FLAKE OFF!  Leaving white marks, which will ultimately not be able to be written on!  For the price of this product you would HOPE it would last longer then 1 use!!  I would like to be able to complain to the company and ask for a new mural to see if it is a fluke, but I have no way of getting in touch with anyone... I would say for ease, it is great, for durability BOO, and not worth the price!  Just paint the wall!
3993803
The markers provided a really nice color on our chalk board, however they leave a very visible ghosted image on the board. I will add the caveat that our chalk board isn't like the super fine finish like those of yesteryear in school, but we just moved to Texas, and now everyone who comes to our kitchen knows that "Ticks are dicks" due to our documenting our dog's experience with ticks.
3974864
I wanted to love these and they work really well - used all 3 for a few weeks straight to cover little ramekins of various baby food...They do stain really easily and if you try to clean them and rub just a little the beeswax rubs off and then is essentially ruined.
2551567
They are convenient for writing on chalkboards instead of chalk. They do take time to get ink to the tip, but overall there a great product.
3803995
We had chalkboard installed as our stair risers.  Did some testing before putting chalk on.  These work really good, bright colors, but the silver and gold do not come off.  Had to use rubbing alcohol and then there was still residue.  The other colors do come off.
1458839
These Chalk Markers write great but they are impossible to get off of your chalkboard. I ended up having to purchase chalkboard paint and repaint my chalkboard to hide the left over lines and residue. I tried every cleaning trick in the book with no luck. Unfortunately, these are going in the garbage.
4428281
these ruined my daughter's dry erase board.  the only markers to do this.  It took serious scrubbing with Dawn and an hour with a rag to get it off and it still stained the board.  Unhappy with purchase.
1585857
Works great on everything except chalkboard. I think they should have to put a large warning because it seems like a lot of people would buy this specifically for the chalkboard. Ruined my new chalkboard...I tried everything to take it off but its a no go. Super disappointed.
121543
Beautiful colors and they work great. They say liquid chalk but are not made for chalkboards. They will stain them.