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[King Louis XIV]

I've recently settled down in a new fortress, far out in the northern tundras of the world, encasing twenty poor dwarves in ice and snow.

My problem is this: When I'm making a shaft downwards into the earth, I encounter disappearing stairwells when I try to mine further down into the ice. I suspect this is a result of a magma pipe directly below, however, spying rock, I decided to make a stairwell there, instead. To my surprise, I found that the downward stairway I carved out was yellow.

"Yellow?" I asked myself. "Did magma get in there, or something, somehow? ... But, magma is red..."

Upon further inspection of the offending yellow tile, I saw it was a "yellow sand downward stairway." I did a pretty big double take. I don't have any sand. There's no sand for miles! I went on to conclude that this was a bug, and when I found it to be undiscovered (as far as I know) I decided to report it here.

I've included a save, and a note next to the 3 tiles in question. Mine a downward staircase one row below the Up/Down stairwells, and you'll see what I mean. I'm not certain if this happens with Up/Down stairwells too, but I'd assume so.

http://www.mediafire.com/?sharekey=785866ff9d1db54cd2db6fb9a8902bda

[Aqizzar]

Yeah, this is a weird problem of mud drying turning stone tiles into yellow sand.  Not in a "dryed mud leaves sand" way but in a "screws with tile tags" way.  Seen it happen a few times myself, but I didn't think it could happen on maps without natural sand.

[Yanlin]

Can you collect the sand and make glass? You need to build a huge shrine around the tile out of glass produced from said tile if you can.

[Foa]

Can you collect the sand and make glass? You need to build a huge shrine around the tile out of glass produced from said tile if you can.

You need bags and fuel to make green glass.
Or you can go make the finer quality with pearlash.
Maybe you can make three rough glasses so you can make crystal glass.

[King Louis XIV]

Can you collect the sand and make glass? You need to build a huge shrine around the tile out of glass produced from said tile if you can.

You need bags and fuel to make green glass.
Or you can go make the finer quality with pearlash.
Maybe you can make three rough glasses so you can make crystal glass.

There's a magma pipe right below the offending area, and I'm sure tanning a few hides for bags won't be too hard. The tough part would be pearlash - Since I'm on a glacier, there aren't any trees. Any logs to make ash would have to come from traders.

[Draco18s]

Digging stairs in ice fails most of the time, just outright.

[eerr]

why?

[MagicJuggler]

Can you collect the sand and make glass? You need to build a huge shrine around the tile out of glass produced from said tile if you can.

You need bags and fuel to make green glass.
Or you can go make the finer quality with pearlash.
Maybe you can make three rough glasses so you can make crystal glass.

Wait...you can MAKE Crystal Glass?

[Draco18s]

Can you collect the sand and make glass? You need to build a huge shrine around the tile out of glass produced from said tile if you can.

You need bags and fuel to make green glass.
Or you can go make the finer quality with pearlash.
Maybe you can make three rough glasses so you can make crystal glass.

Wait...you can MAKE Crystal Glass?

I do believe that's how it works, yes.  You take glass and some rock crystal, and bam, you make crystal glass.

[MagicJuggler]

That's not what I meant...I thought without needing rock crystal...oh well...

[Toady One]

Okay, I've downloaded it, though I don't currently understand the description.  I'll have to take a look at it.

[LegoLord]

Can you collect the sand and make glass? You need to build a huge shrine around the tile out of glass produced from said tile if you can.

You need bags and fuel to make green glass.
Or you can go make the finer quality with pearlash.
Maybe you can make three rough glasses so you can make crystal glass.

There's a magma pipe right below the offending area, and I'm sure tanning a few hides for bags won't be too hard. The tough part would be pearlash - Since I'm on a glacier, there aren't any trees. Any logs to make ash would have to come from traders.

Use potash made from lye to make the pearlash.  Lye is made from animal tallow, so with enough animals, you should have plenty.

[Christes]

lye is made from ash

wood -> ash -> lye

You're probably thinking of tallow + lye -> soap

[LegoLord]

lye is made from ash

wood -> ash -> lye

You're probably thinking of tallow + lye -> soap

Lye made from tallow is the same as lye made from ash (in DF).

[phlamethrower]

I've just encountered this bug as well, in 40d11, with the Orc mod.

First I unwittingly created a red sand downward staircase, but then later on while rescuing a trapped dwarf I discovered that removing a constructed wall will create sand tiles also.

On a glacial map:
1. Dig out ice, leaving behind water and felsite floor
2. Build felsite wall ontop of the felsite floor
3. Remove wall
4. Felsite floor is now red sand floor!

A bit of experimentation suggests that this only happens to tiles which are originally ice walls ontop of rock floors. Ice ontop of ice, or rock ontop of rock, do not change floor tile if a construction is removed.