B
I have decided to bore you with the standard "gray to gray
gets gray, BV to gray gets 50% of each" etc....
if you need help figuring this, READ ON!
I will be using a simplified code system to help everyone
understand what information is available.
Heterozygous - sometimes noted as "het" or "hetro".
This means the chinchilla carries more than one type of gene.  It can produce offspring that are different then the parents. A het beige chin carries a gene for gray as well as the beige gene, so it can produce gray young.   Heterozygouns chin possess both dominate and recessive genes and can pass either
or both genes to offspring.
Homozygous - possess two of the same gene, dominate or recessive, that express a trait (color). Grays have 2 genes for gray, they are homozygous for gray.  "Homo" beige have two genes for dominate beige.  Only when the genes occur in homo form will the certain recessive traits show in  true color of that gene.  Depending on genetic make up of each parent, it is possible to predict potential outcome of the mating.
See the chart for break down of chin color percentages
Reading the code
B is dominate beige / b is normal gray
W is white / w is non-white
V is velvet / v is non-velvet
E is ebony / e is non ebony
+I is violet / ic is violet carrier
+S is sapphire / sc is sapphire carrier
rB is recessive beige and would take the
same place as beige / gray.
Standard gray would read
(bbwwvvee)
Applying the code
{Ebony will be of some conceren. 
EE is very dark "homo",
Ee is "hetro"
and
eE is carrier.}
If
-b is used this shows no gray is carried as in
violet and sapphire. These will  only appear at
the end of line
if shown or carried.
A gray wrap carrier of violet reads
(bbwwvveE+I).  If this
was a BV (bbwwVveE+I)
This information comes through me from various sources including: printed materials, internet and discussions bth in person, by phone, mail and email.
But first - some common terminology...
Gray (bbwwvvee)

to Gray (bbwwvvee)

All gray offspring
Gray to
White

(
bbWwvvee)
50% each gray
and white
B
Gray to
Black Velvet
(bbwwVvee)
50% each gray and BV
Beige (Bbwwvvee)
to White (bbWwvvee)

25% each Beige, white, gray and
PinkWhite (BbWwvvee)
White (bbWwvvee) to
Black Velvet (bbwwVvee)
25% each White, gray, black velvet
and Black/white cross (bbWwVvee)
Breeding White to White or Black Velvet to velvet is NOT a recommended practice!
Beige (Bbwwvvee) to
Black Velvet (bbwwVvee)

25% each Gray, black velvet, beige
and Brown Velvet (BbwwVvee)
Home      Chin Main
Chin Genes     Discussion
UNDER CONSTRUCTION
Chin Type
Gray to
Beige (het)
(BbwwVvee)
50% each gray and Beige
Chin mix 2
Gray
(bbwwvvee)
to
Now we have added 3 more colors that combine two dominate genes:
PinkWhite(BbWwvvee), Brown Velvet or TOV beige(BbwwVvee)  and Black White cross(bbWwVvee) or TOV white.
Let'ssee what these get when breed to other colors and each other.
Brown Velvet (BbwwVvee)
25% each Gray, black velvet, beige
and Brown Velvet (BbwwVvee)
PinkWhite(BbWwvvee)
25% each Gray, white, beige
and pink white (BbWwvvee)
Black White cross (bbWwVvee)
Gray, black white cross,
white, black velvet
NOT RECOMMENDED
Black White cross/TOV white
(bbWwVvee)

Gray, black white cross,
white, black velvet
NOT RECOMMENDED
Beige (het)
(BbwwVvee)
Black Velvet
(bbwwVvee)
White
(bbWwvvee)
NOT RECOMMENDED
Gray, BV, PW, Brown Velvet, beige, white black white cross &
Brown White Cross
(BbWwVvee)
Gray, BV, PW, Brown Velvet, beige, white, black white cross &
Brown White Cross and homo beige
(BBwwvvee)
Gray, BV, PW, Brown Velvet, beige, white, black white cross &
Brown White Cross
(BbWwVvee)
Beige
(het)