Product Name
Cold War Kush Feminized
RKS GENETICS
SC LABS
Independent Third-Party Verification Lab
2440 Industrial Pkwy West · Hayward, CA 94545
Tel: (510) 555-2240 · lab@cannalytics-coa.com
License #: C8-0000091-LIC
CERTIFICATE OF ANALYSIS
· GENETICS PROFILE ·
DOC ID: CAN-2026-04-CWK-0853
Lab verify
cannalytics·coa
cannalytics·coa
RKS genetics
royalkingseeds.de
royalkingseeds.de
HERITAGE RESERVEGeneration:S1 FEMINISIERT·Line:RKS Reserve Line
Phenotype:CWK-Pheno #6 (Earth-Forward)
Client / Brand
Royal King Seeds Ltd.
Strain Genetics
Indica-dominante Kreuzung (35/65)
Sample ID
RKS-CWK-FEM-0853
Batch / Lot Number
CWK-2026-0853
Production Date
2026-03-04
Date Received
2026-04-14
Date of Analysis
2026-04-18 — 2026-04-27
RKS Stabilized Line
S1 · Trait-Locked
Verified Genetics
ISO 17025 Co-Signed
Breeder-Selected Phenotype
CWK-Pheno #6 of 14
RKS BREEDER NOTES
Batch No. CWK-2026-0853 · Heritage Reserve · Cycle 52
From the RKS Breeding Floor
The Cold War Kush stabilization program at RKS focuses on three traits: resin density, structural compactness, and cold tolerance. The phenotype documented here was selected across three cycles and twelve mothers per cycle, with only the plants meeting all three criteria carried forward. The data on this Certificate reflects the upper-percentile expression you can expect when these seeds are grown under our breeding-room SOPs — a benchmark, not a guarantee. The line traces to a Purple Punch × Bubba Kush cross, with each generation selected to fix the traits that define Cold War Kush.
Breeding Objective · CWK-Pheno #6
- Stabilize potency floor at the lower bound of the THC band
- Tighten cohort variation to ≤ 12% on total cannabinoids
- Preserve aromatic identity across generations
- Maintain trichome density ≥ 28% across cohort
D. Van Royen
Master Breeder · Royal King Seeds
Genetics verified by RKS Breeding Team
Genetics verified by RKS Breeding Team
Total THC
21.4%
Total CBD
0.16%
Total Terpenes
1.62%
Safety
ALL PASS
Cannabinoid Profile
| Analyte | Distribution | Result (%) | mg/g | LOQ |
|---|---|---|---|---|
| THCa | 22.51 | 225.1 | 0.05 | |
| Δ9-THC | 1.66 | 16.6 | 0.05 | |
| CBDa | 0.14 | 1.4 | 0.05 | |
| CBD | 0.04 | 0.4 | 0.05 | |
| CBG | 1.19 | 11.9 | 0.05 | |
| CBC | 0.28 | 2.8 | 0.05 | |
| CBN | 0.17 | 1.7 | 0.05 | |
| Total THC ((THCa × 0.877) + Δ9-THC) | 21.4 | 214.0 | — |
LOQ = Limit of Quantitation. ND = Not Detected. Results reported on dry-weight basis.
Terpene Profile
| Terpene | Concentration | Result (%) | mg/g | Aroma Note |
|---|---|---|---|---|
| Myrcene | 0.630 | 6.30 | Earthy, mango | |
| Caryophyllene | 0.430 | 4.30 | Spicy, peppery | |
| Linalool | 0.290 | 2.90 | Lavender, sweet | |
| Pinene | 0.230 | 2.30 | Pine, fresh forest | |
| Bisabolol | 0.040 | 0.40 | Chamomile, honey | |
| Total Terpenes | 1.62 | 16.20 | Earthy, mango |
Safety & Contaminant Screen
Pesticides & Plant Growth Regulators
66-analyte panel · LC-MS/MS & GC-MS/MS
Heavy Metals
Pb, Cd, As, Hg · ICP-MS
Microbial Impurities
Salmonella, STEC, Aspergillus spp. · qPCR
Mycotoxins
Aflatoxins B1, B2, G1, G2 · Ochratoxin A · LC-MS/MS
Residual Solvents
Cat I & II solvents · GC-MS Headspace
Foreign Matter
Visual + microscopic inspection
Filth & Foreign Materials
Insect frag., mammalian excreta, hair, mold
Water Activity & Moisture
aw meter · oven loss-on-drying
Quality Metrics
Moisture Content
9.8%
Water Activity (aw)
0.59
Density (g/mL)
0.41
Phenotype Consistency & Stabilization Line
Phenotype Consistency
The values reported on this Certificate reflect the top-performing phenotype(CWK-Pheno #6) selected from a 14-plant cohort of the RKS Cold War Kush S1 line. Across three production cycles, individual plants from this seed line have fallen within a 10–15% variation envelope on total cannabinoids and total terpene yield when grown under comparable indoor conditions.
Note: phenotype expression is subject to environmental conditions (light, nutrients, VPD, training). These figures are not a guarantee of grow outcome.
Stabilization Status
S1 FEMINISIERTThis line has been stabilized through successive inbred generations with phenotype-driven selection. Trait-locking criteria for the CWK-Pheno #6 selection:
- Earth-forward terpene expression
- Trichome coverage ≥ 30%
- Stable purple/dark coloration where genotype carries it
- Mid-canopy bud uniformity
- Mold resistance under high RH
- Cohort variance ≤ 7 days
Expected Grow Outcomes
Flower Time
9 – 11 Wochen
weeks
Yield (Indoor)
493–636
g / m²
Yield (Outdoor)
443–686
g / plant
Plant Height
93–156
cm indoor
Difficulty
Easy
beginner+
Reference outcomes are based on RKS breeding-room conditions: 600–900 PPFD, VPD 1.0–1.4 kPa, mineral-fed coco substrate, 18/6 veg · 12/12 flower. Outcomes will vary with cultivator skill, environment, and phenotype selection.
Analytical Methods
HPLC-DAD
Cannabinoid potency by reverse-phase HPLC with diode array detection. SOP-CAN-101 Rev 4.
GC-FID Headspace
Terpene quantification · 38-analyte target list. SOP-TER-204 Rev 2.
LC-MS/MS & GC-MS/MS
Pesticide and mycotoxin screening with QuEChERS prep. SOP-PES-310 Rev 5.
ICP-MS
Heavy metals (Pb, Cd, As, Hg) digested via microwave HNO₃. SOP-MET-115 Rev 3.
qPCR Microbiology
PathoSEEK® assay for Salmonella, STEC, and Aspergillus. SOP-MIC-401 Rev 2.
GC-MS Headspace (Solvents)
Cat I & II residual solvents per USP <467>. SOP-RSV-220 Rev 3.
Laboratory Authorization
Dr. Theodore Whitman
Dr. Theodore Whitman, Ph.D.
Senior Analyst · Mass Spectrometry
Mark Linden
Mark Linden
Laboratory Director · ISO 17025 Approving Officer
Disclaimer of variation · Results published in this Certificate represent a selected phenotype of the RKS Cold War Kush S1 stabilized line under controlled indoor conditions. Individual seedlings may produce plants that vary by approximately 10–15% on total cannabinoids and terpene output, and may express alternate phenotypes within the line. Final cannabinoid and terpene expression is subject to cultivator inputs — lighting, substrate, nutrient regime, environment, and training technique. This document is intended as a reference benchmark of the genetic potential of the RKS Cold War Kushline, not as a guarantee of any individual plant’s outcome.
Note for seed buyers · This Certificate analyzes mature, cured flower from a selected reference plant cultivated by the RKS breeding team under controlled conditions. Seed-grown plants may vary slightly from the tested phenotype depending on environment, nutrient regime, and grower input. For best expression of the CWK-Pheno #6profile, follow the cultivation reference outlined in the “Expected Grow Outcomes” section above.
Note for seed buyers · This Certificate analyzes mature, cured flower from a selected reference plant cultivated by the RKS breeding team under controlled conditions. Seed-grown plants may vary slightly from the tested phenotype depending on environment, nutrient regime, and grower input. For best expression of the CWK-Pheno #6profile, follow the cultivation reference outlined in the “Expected Grow Outcomes” section above.