I decided to do a Periodic table of The Powder Toy by use !set tmp pipe #.
I found positive results! Below is a list of elements with the corresponding number to get them. I couldn't get all elements so the ones that aren't listed below can be found in the games various Classes.

Better yet, just type: !set type "1st element name" "abbreviation of element you want". (dont forget the space!)
The list is long so if you don't like long post, too bad, I'm sorry. I hope you can find this useful.

LIST
Console Command: !set pipe tmp #

Notes:
SPWN2 is the only element with 5 letters.
!set tmp pipe 158-256 elements are missing, unknown or non-existant.
!set tmp pipe 257 (dust) seems to spawn a dust of lighter color - Interesting.
Every element from 257 and Up has a 1 pixel lighter color than normal.

# - Element (According to tmp #) _ represents a space when using the console.

1 dust
2 watr
3 _oil
4 fire
5 stne
6 lava
7 _gun
8 nitr
9 clne
10 _gas
11 _c-4
12 _goo
13 _ice
14 metl
15 sprk
16 snow
17 wood
18 neut
19 plut
20 plnt
21 acid
22 void
23 wtrv
24 cnct
25 dstw
26 salt
27 sltw
28 dmnd
29 bmtl
30 brmt
31 phot
32 uran
33 _wax
34 mwax
35 pscn
36 nscn
37 _ln2
38 insl
39 vacu
40 vent
41 rbdm
42 lrbd
43 ntct
44 sand
45 glas
46 ptct
47 bgla
48 thdr
49 plsm
50 etrd
51 nice
52 nble
53 btry
54 lcry
55 stkm
56 swch
57 smke
58 desl
59 coal
60 _lo2
61 __o2
62 inwr
63 yest
64 dyst
65 thrm
66 glow
67 brck
68 cflm
69 firw
70 fuse
71 fsep
72 amtr
73 bcol
74 pcln
75 hswc
76 iron
77 rime
78 gol
79 dlay
80 _co2
81 dric
82 bubw
83 stor
84 pvod
85 conv
86 dmoe
87 __34
88 llif
89 stan
90 spng
91 rime
92 _fog
93 bcln
94 love
95 deut
96 warp
97 pump
98 fwrk
99 pipe
100 frzz
101 frzw
102 grav
103 bizr
104 bizg
105 bizs
106 inst
107 isoz
108 iszs
109 prti
110 prto
111 pste
112 psts
113 anar
114 vine
115 invs
116 eqve
117 spwn2
118 spwn
119 shld
120 shd2
121 shd3
122 shd4
123 lolz
124 wifi
125 filt
126 aray
127 bray
128 stk2
129 bomb
130 _c-5
131 sing
132 qrtz
133 pqrt
134 seed
135 maze
136 coag
137 wall
138 gnar
139 repl
140 myst
141 boyl
142 lote
143 frg2
144 star
145 frog
146 bran
147 wind
148 __h2
149 soap
150 bhol
151 whol
152 merc
153 pbcn
154 gpmp
155 clst
156 wire
157 gbmb

You can go higher with the numbers, and will result in a 1 pixels Lighter color for that element, but the numbers beyond 256 are unknown to me so go for it!

WARNING: Higher numbers may result in TPT crashing, so save often!

By typing !set tmp pipe #

Yes, I typed !set tmp pipe 1, pressed up arrow, erased 1, typed 2, pressed enter and so on. Then I went back and numbered them in notepad because TPT won't let me save any stamps for some odd reason.

I also tested the properties of CLST and WATR and only found a 1 pixel lighter difference in color.
I hope I can find something useful, like a unintentionally programed or glitched element people can use and save.

I should be put in the Notible Users section for creating the periodic table, but I need to complete it first. There's still a few elements I couldn't or didn't find by doing this. Don't know why but I'll keep trying.

@ MasterMind555

UI had no idea it was listed in the code like that, I just did it by hand. Well I guess I won't see my name in NU. LMAO.

But seriously I thought I found something New. My bad for posting this thread.

@ Cr15py

No, No it's Not. I was fooling around with the Console... that's all........