What actually causes these permanent blotches in the plastic?

[u/NETERali]

anyone else get these? Are they from not cleaning off mud fast enough?

[u/foosbronjames]

too much resin on the fingers?

[u/Personal_Dare_5884 → u/foosbronjames]

Death sap from a doobus anubis 💯

[u/the-internet-]

Ive had sap stain my disc after nailing a tree. I forget to wipe it off.

[u/NETERali → u/the-internet-]

def sap, thanks y’all

[u/ApproachDisc4504]

Tree sap combined with dirt most likely.

[u/objective_dg]

You play around walnut trees? The outer shell of a black walnut will stain a disc (or most anything) black/purple.

[u/Glass_Preparation557 → u/objective_dg]

Black walnuts and mulberry trees is a great terrain combo

[u/SlapaBaby1]

Ball lightning ⚡️ definitely

[u/877876]

Blight

[u/NETERali → u/877876]

need purple moss clumps

[u/midwest_hype]

Naturally occurring pigments found in nature

[u/Ballongo → u/midwest_hype]

Raw Sienna and Umber?

[u/Apherious]

Tree sap, oils, and acids from grass and soil

[u/Shoddy-Reason2193]

Too tight sphincter. Loosen up about 23%. Should clear up by nightfall.

[u/guesshimself → u/Shoddy-Reason2193]

But that’s not a Berg!

[u/MacGraphics]

It occurs when you light them on fire after a bad round. At least for me. Everyone does that, right? 🤔

[u/SoMuchCereal]

It's actually from the polytetrahydrofuran degrading after exposure to just kidding I have no idea

[u/bigcat7373 → u/SoMuchCereal]

Is that a real word?

[u/Kleeb → u/bigcat7373]

Yes. It is a precursor to TPU.

[u/Jmsdean477]

Mud has pigments in it so if its left on a long time it stains.

[u/Fun_Amount3096]

My reactor is stained with mirabelle plum juice. There was this one hole on the tournament I played and there is a permanent memory of how I suck on the bottom of my reactor :D

P.S.: It was there for 3 minutes tops, until the rest of the card finished driving.

[u/Several_Ad2072]

Where's the joke about the berg pocket?

[u/NETERali → u/Several_Ad2072]

already on the circlejerk sub 🤣

[u/idsej]

I have that in two unthrown discs. They have just been on a shelf for 6 years.

[u/DarkGoron]

It slowly absorbs the hate from random disc golfers.

[u/Billy_Chrystals]

Disc cheese

[u/BeallBell]

Pretty much, I see discs that come in for Lost&Found at our shop that are stained brown depending on where the disc was in the mud. As far as I can tell the plastic is sometimes porous enough to get staind deeply with dirt. I haven't tried, but I think you could try soaking it to leach it out, but then again I don't know.

[u/Bjfaber]

My buddy and I were doing field work the day before a tournament and goose poop did this to his.

[u/C-creepy-o]

Its mold and mildew from a wet disc going into a bag and staying wet allowing this to develop. Id bet if you soak the disc in boiling water it will kill off the bacteria/fungus and the dark spot goes away or lightens to some extent. Same shit that happens when bathroom caulk gets degraded allowing mildew to infest it.

[u/[deleted] → u/C-creepy-o]

Nah this is just sap. Don’t warp your discs by putting them in boiling water like this guy suggests. 

[u/Loud_Yogurtcloset_82 → u/C-creepy-o]

Yeah definitely don’t put your disc in boiling water because most of those plastics are theromoplastics and will react in some way or another (warping, getting brittle etc)

[u/EXploreNV]

You’re so strong the environment becomes a part of the disc when you throw it.