mpfirnhaber

Some recent acquisitions. The top brick is a modern 3001, probably the result of switching from pink to green while making bricks. These transition bricks are usually destroyed. The bottom brick is a Bayer test brick in trans-neon green.

Here are the results of some temperature tests on Lego test bricks (modern ABS). Temperatures are in Celsius. Source: https://www.flickr.com/photos/129727166@N02/

Not my picture, but I just bought the brick. I've never seen a marbled Duplo 2x4 before :)

Mmm, glitter.

Aye, it's not for building, and it's staying on the sprue :)

http://brickset.com/sets/7194-1/Yoda

Yes, the large bricks are Jumbo, produced in the US by Samsonite. There are actually two kinds, the US version and the Euro version. The Euro version is exactly 3x the size of normal bricks - the US version is a non-standard size. You have the US version. The 2x3 is an old brick made by Samsonite, they used cheap, soft plastic in the 60s. The square studs parts are not Lego.

I would be more inclined to call it non-production than prototype. I bought it from a BL seller in Germany who sells a lot of parts in unusual colors. I'm guessing he has a connection to a model shop or similar source. I don't know much more than that. I just missed out on a red chain. I hope to get another chance, I would love to add one to my collection.

New stuffs. Blue - Medium Blue - Glow in the Dark

I'm open to that idea :) You mean a tortoise?

Those yellow plates are wonderful :) All I have managed to find is a single 2x3 in trans yellow. Can't build much with that...

A fun BrickLink purchase :) The external board is wired straight to the internal board. It plays the "doorbell then dog bark" sound from the brick in set 5771 - Hillside House. Searching the number on the chip (39VF020) reveals it's a simple flash memory chip. The board (AMA9AA) brings up pages from a Chinese company, Alpha Microelectronics, thatseems to specialize in voice/sound synthesizing hardware. There are references to software called EZSpeech and FlashWriter. There are download links for the software on their website, but they are password protected. Oh well. I never truly thought I could program my own sound bricks. I bought this as a novelty - and I think it will remain a novelty :)

1987-1990 Futuron, Blacktron, Space Police, Pirates, Forestmen, Black Knights... So many epic sets in a span of just 4 years, and I was the perfect age at the time to enjoy them :)

Classic Space and Futuron. I have enough parts to build any model from either series :)

Yeah, his prices go up and up with each piece he sells. I didn't pay nearly that much for mine...

Yep, bright light orange. They do make a nice pair!

Two non-production colors. I've also seen black. Any others out there?

Yes, your collection has many "true" prototypes parts that were never sold in sets in any colors at all. But we're talking about the other thing you mentioned - the making of red parts to try new molds and check for faults. These red parts are commonly referred to as "prototypes". The question we are wondering about is - are my red parts actually mold tests, or are they just red parts that were made for model builders, or for sets that were never released? I wonder where that idea about red parts even came from? Is it the truth, or just a fan theory? It doesn't explain other colors, like black and trans-clear ghost shrouds, or blue cats and pteranodons. There's a lot of weird colored stuff out there, and a lot of it happens to be red, so who knows...

Exactly what I mean. I don't know of any way to distinguish between the two.

A new color scheme for 6824.

Red parts. Some may be prototypes, it's hard to know for sure.

More space parts, all non-production colors. I still need the space gun in green and brown...

No, the sword is hard plastic like other transparent parts.