"Probably only uses diamonds..."
Did you use a REACTION_CLASS?
Oh, and another idea: Perhaps, once you implement all of the interesting stuff, you could have a "refine gems" reaction to replace the refine diamonds one, and give each gem one of a few refined-gem "metals." I'm not sure how many of the refined-gems you'd need, though...
REACTION_CLASS?
Oh no I think I missed something
Anyway, I finally got around to adding dye plants. And slimes still melt. So I will post their raws here.
[CREATURE:SLIME]
[DESCRIPTION:A cute and intelligent blob of goop that haunts the caverns, hopping around all day. It's known for its tenacity but can be quite dangerous, and they may be captured and trained by creepers.]
[NAME:slime:slimes:slime]
[CASTE_NAME:slime:slimes:slime]
[CREATURE_TILE:254][COLOR:2:0:1]
[PETVALUE:32]
[FREQUENCY:110]
[NOBONES]
[NATURAL]
[NOT_BUTCHERABLE]
[BIOME:SUBTERRANEAN_CHASM]
[UNDERGROUND_DEPTH:2:3]
[PET_EXOTIC]
[NO_EAT]
[NO_DRINK]
[CAN_LEARN]
[MOUNT]
[TRAINABLE]
[EXTRAVISION]
[POPULATION_NUMBER:300:500]
[PREFSTRING:adorable faces]
[BODY:SLIME_BODY]
[USE_MATERIAL_TEMPLATE:SLIME:SLIME_TEMPLATE]
[USE_TISSUE_TEMPLATE:SLIME:SLIME_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:ALL:SLIME]
[HAS_NERVES]
[CREATURE_CLASS:GENERAL_POISON]
[GETS_WOUND_INFECTIONS]
[BODY_SIZE:0:0:24000]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[MAXAGE:5:10]
[ALL_ACTIVE]
[NO_SLEEP]
[NO_DIZZINESS]
[HOMEOTHERM:9950] This was an attempt to chill them. It didn't work.
[CASTE:SLIME]
[MALE]
[CASTE_NAME:slime:slimes:slime]
[CHILDNAME:mini slime:mini slimes]
[CASTE:SLIMETTE]
[FEMALE]
[CASTE_NAME:slimette:slimettes:slimette]
[CHILDNAME:mini slimette:mini slimettes]
[MULTIPLE_LITTER_RARE]
[SET_TL_GROUP:BY_CATEGORY:ALL:SLIME]
[TL_COLOR_MODIFIER:GREEN:1]
[TLCM_NOUN:body:SINGULAR]
[ATTACK:SHOVE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD]
[ATTACK_SKILL:WRESTLING]
[ATTACK_VERB:shove:shoves]
[ATTACK_CONTACT_PERC:70]
[ATTACK_PRIORITY:MAIN]
[SELECT_MATERIAL:ALL]
[MAT_FIXED_TEMP:9940] This was also an attempt to chill them so they wouldn't melt. It didn't work.
And now, their custom tissue!
[TISSUE_TEMPLATE:SLIME_TEMPLATE]
[SCARS]
[TISSUE_MATERIAL:LOCAL_CREATURE_MAT:SPONGE]
[RELATIVE_THICKNESS:1]
[HEALING_RATE:200]
[VASCULAR:2]
[PAIN_RECEPTORS:5]
[CONNECTS]
[INSULATION:200]
[TISSUE_SHAPE:LAYER]
While they don't melt just by existing in the arena, they will turn into gloopy puddles in Warm biomes and even titanic slimes melt after one creeper explosion, making them absolutely pathetic enemies.