Refer to knowledge gained from marble research during this step.
Marbles with air bubbles.
Christensen agate produced slags in a variety of colors.
Newer marbles will have slightly different colors in their designs and the designs themselves often look different.
The older bubbly master marble translucent 1 color cat s and later 11 16 3 vein master.
Don t worry if the mixture develops air bubbles.
Or is there something else going on here.
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As a rule of thumb vintage american cat s eyes tend to have very clear glass.
Compare the colors of one type of marble to another.
Mix 5 grams of calcium lactate with 4 cups 950 ml of water.
These are transparent color base marbles with opaque white swirls in them.
Air bubbles are fairly common in certain machine made marbles and ive seen them used a lot in contemporary marbles as well.
Add 5 grams of calcium lactate.
Pour 4 cups 950 ml of water into a large bowl separate from the first bowl.
These will go away as you prepare the other ingredients.
Stir the 2 ingredients together with a spoon until the calcium.
Second the christensen agate version tends to have tiny air bubbles inside it which the akro version does not.
Cat s eye marbles are still made today and they remain the most common type of toy marbles sold in the world but most of those sold are of poor quality with green tinted glass.
Older marbles will have certain bubbles or flaws caused by the glass blowing process.
Im a little unsure of how they can exist without cracking the marble though.