Mini Milk Pitcher

In the 70's, the vaccuum or double-walled insulated mugs were just starting to be produced. I had been going to trade show, and bought some insulated mugs. I noticed the similarity to the construction between that and the milk pitchers that were on the market. The current magic milk pitchers had a liner inside that was removeable for cleaning, but they were also problematic, as they sometimes cracked or some were glued in place and made cleaning difficult.
The insulated cups could be modifed very easily to make excellant milk pitchers. You merely drilled a few holes in the plastic, and the milk pitcher application could be applied.
Drill one hole at the top of the cup or pitcher, as an air release valve. Then, onthe other end of the inside of the mouth of the glass or pitcher, drill several holes in a cluster on the inside of the pitcher. This allows the liquid to fill.
To set it up, submerge the cup in a sinlk full or a conatiner full of the liquid you wish to vanish. Preferable, is the fake milk called oom, or "oil of milk" (water based machine oil). You can use real milk, or a dark liquid.
The object is to fill the inside liner of the glass and then empty the main container out. So the glass is in essence empty, but the liner of the insulated mug is full of liquid.
As you pour  or tilt the glass, the liquid will come out from the liner and enter the main body of the glass or cup. The level of the liner will deplete and soon equal the contents of the glass.
When you right the cup, it should look as if 2/3 of the glass has vanished. If you held a rolled up newspaper in front of that glass as you poured, the illusion will be that the liquid has been poured into the news.
Place the cup aside, and then unroll the news as if the liquid has vanished from the paper.
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Several dealers have made these milk pitchers and sold them, but you can find these in most dollar shops in many sizes and they look so "ungimmicked" and natural, they are actually a better device than the commercial ones.